Malicious PDF — malware analysis report

Static analysis result for SHA-256 3679c49c6edc9b86…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 10:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df93403c0cb560a6a4a245ba01f6fc11 SHA-1: 84bb7bd78d3dbff95d224976a6f3feebf567aff8 SHA-256: 3679c49c6edc9b86683e64c88025e71a1943dbbb80e84c95e70802e8ed76c7c5
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a 'download button' lure and a callback lure further indicates a malicious workflow designed to trick the user into downloading a payload or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://crewmak.ru/uplcv?utm_term=telugu+new+movies+hd+2018+download PDF link annotation
    • http://sochisushi.nl/survey/userfiles/files/zobifenapo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6cb324b9e5bbcd17547928673798bbde/kepamefalomutemisu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b0aef5e9479eec3a77b7897bd866d384/xifozobibev.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bqei93lcn6qbc2ule2bm7kmeb2/xirex.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/39652212972.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/11945550116.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ec966193ef35fe6b6f1c1ce718abbd79/34942823714.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/radaximenewesomen.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/kewafaxakok.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/fb8959db169c537a66a7e40e06fa9492/22717164274.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/repanawuwulawut.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161316b891bb5b---gepemegosa.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902164727_1h98vs.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/167432761.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/xowetojipizetavop.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/75108985200.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/penaju.pdfIn PDF document text
    • http://mosjob.ru/images/file/99252340390.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/75227514960.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/10748276012.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/28336041533.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/fotenokuvilesulu.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 11212 bytes
SHA-256: 31c86296a5d9f26d6c6040358a822eb243d1c791ddf30087a5bdaa3c19a2cba8
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 17416 bytes
SHA-256: 715fd143104a0f621a522d7a1774ccfcf7a1537824cf589a7f1123af69d12d09

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