Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78fee7e47845648…

MALICIOUS

PDF

117.6 KB Created: 2021-06-29 09:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17b7e707b77b911baa5a406e24b0c079 SHA-1: 87f2f4d9bcc87a4e9570ce13366e0eba72adf0a4 SHA-256: a78fee7e47845648909da5346d4a36406c0cf8a9bf704df08c911d437f226f71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a phishing or malware distribution scheme. The presence of these links and the overall detection score strongly indicate an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9234

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd34a6c215---22685101822.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5nbsn7mnp5bsjge6h2d0ujjs7o/24943426754.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e4b107ce8004ec734cec416df8d5ef9c/fululuzanaputuko.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160908cce4786d---63924279428.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vo1jgi83ha7ig2m5l41vnv8ltk/volena.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc982f2e7d---zuraritavuwizevasixokitis.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c8e47ea5---30536662164.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/60168948868.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e7bb84fc645d6227281118f7b6205ee7/98480687861.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d7452ac0928188a40b95cb3ef8c5e22/37815110883.pdfIn PDF document text
    • https://davaocarrental.com/images/file/87359973444.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b248f1de964---94754078145.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/veselizabimujurapefi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/653b67cb87d0bbca94764713376acc24/29688572591.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37e00dc32---24661929480.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tuxivuli.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb648379dd---16278828770.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e2f24f0e---topokenujunetudibib.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eafca788acf7f760c490a39bc688b7c2/5694536711.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/85801551127.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/ranux.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/humrr7b306edud1gm8u872d5t4/37645639806.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/73761295339.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/saduvajitaxu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d168d6f6f3---12986659159.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0ce72fdb82c039828539b16530aa80fc/xemofabepuvovopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sentence+of+kind+heartedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000153d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153D5 24984 bytes
SHA-256: 925c2ab6a2e9681e99e1bd46fd7e72cfaef420f7d6afe252cab4ef682289e485
font_00_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 28856 bytes
SHA-256: b3aa7a9e9106dfaf90b1fdc5532061c7017d1c21b2b71940814d0fc8a2fd04a5
font_02_sfnt_off00018150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18150 5980 bytes
SHA-256: 9ec09ba05afa72a450a94a4b0817abca1b54f86c373c3170d150531d1987d5ad
font_03_sfnt_off0001964c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1964C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001ae63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE63 10524 bytes
SHA-256: a11a1bd57a6b2bfeddfa3327fc6da91f6070545f999c236ee9926d4ebb209bba

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