Malicious PDF — malware analysis report

Static analysis result for SHA-256 7178928eb3d501cd…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 19:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a695e8e5da636bf8318462a375f810cc SHA-1: e7d5041b96d2409ffeb3d8bd88f49684716bf23b SHA-256: 7178928eb3d501cd633c6304e31b208e395469d4ef3b75bad02f99aca660dbc9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=anxiety+questionnaire+for+adults+pdf PDF link annotation
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/07577a72720f1c8a76b42c1a05e65302/ridagapunotiwujusorabeseb.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ui15516n4sq3o0n2f6eoqeoocr/dezawikavasakazov.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/i6kt7ld8dgcjo458q46tbc6ad6/metotopukujazo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9ca1d186---detafesufuzifoleposixo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81971117d0---zufitekedafokor.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c1d6b3e748ff88f154ebbd4c26eecf9d/pimedogesepexupoxeke.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e7e74523---14604403761.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73404e2174---97785707258.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7f6389231dfe50c75de8ae7fa5997ecc/45165708069.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd5fc5c13---9404316875.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/r07d7o1bqdcvq8bs1kc9ih78mv/magazegajosipemekojuvo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbe18864d---mugodikoravililekiwaver.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/28293279830.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pei7pioo4h79j55kp0h2iasmnr/24688575364.pdfIn PDF document text
    • http://euro-ex.com/96046832429.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lixijavedinexovopavevis.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/449e97461d19aeceebcd82ae1ba0d6eb/50044587370.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jubemenixu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tofevuvamedewabotuparuz.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a388ecd3221---jufugumiwagelodewetava.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/30044428905.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/67895815090.pdfIn PDF document text
    • 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 18432 bytes
SHA-256: 5136ddbd2aba373dc757dfab2ba18be09dba3aea12a587a19b6fa63212a5ca86
font_02_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 10932 bytes
SHA-256: c5c16e59f2443c77afefc3fee3791eeacee4db4191b2bb262ef56f7b066dd93e

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