Malicious PDF — malware analysis report

Static analysis result for SHA-256 036664185c36ae92…

MALICIOUS

PDF

118.6 KB Created: 2021-07-05 04:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eea04301a8c431d8f42f668ef0227fd4 SHA-1: 4f08898112252c6761296618483511eb8224a7d4 SHA-256: 036664185c36ae92f8eb55b36cabfb75a4271a181e2479a10bc483f8e7ffcdc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting domains, a common tactic for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings suggest the PDF is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a169e3a7---51317702821.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c46c59d9---44776667319.pdfIn PDF document text
    • https://termocasasrl.com/file/mixudixediwozetajoravokam.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b279b9d572b---tokotufabuze.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160844b6d4d78b---25731605541.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/83212410422.pdfIn PDF document text
    • https://go2germany.ru/files/file/17134117112.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52dc56b78---zovumo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839847cd575---torikabe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/eff6e037bad1f9f0eee2d327062b2bad/xozefigobazafedadozu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29fcbd6c7---36259365166.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106111643576486.pdfIn PDF document text
    • http://canoeing.by/pics/files/tafixunimesinugi.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dmbq5hct5ohbr9d4r2p82ufnn4/65014907862.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/56134294767.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3cd3a88e7---konevemuwivig.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a23bee25e8fadb13b67982c825b4f5a1/5411810657.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1hi24l7vvbkjc90bvd3uujs6sa/89612225950.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gikevaligusedowu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077397bf13bd---59628545920.pdfIn PDF document text
    • http://teplospectr.ru/images/files/gemariwunota.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/nofapivuvonis.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/liximukewi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48a18a4dc---72167457168.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zemesurodutikar.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mm0np82m8onik97arop15pfe4r/52471061455.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/13637bdd1abc62542bda67f23d2da920/63839826599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=architectural+construction+drawingsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D0 18612 bytes
SHA-256: d8062102e3da4d31b8f59bd7259d3f28538e012eaf4ad08567d426407acf475a
font_01_sfnt_off00019a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A07 10816 bytes
SHA-256: 5c5007ad0eda9f7191126f3cee13195ddb96f92b547c7e14fa0fd6103327530a
font_02_sfnt_off0001b2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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