Malicious PDF — malware analysis report

Static analysis result for SHA-256 7911c263c04dd9b6…

MALICIOUS

PDF

115.6 KB Created: 2021-09-05 02:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e58818ff1e51f1bc11551991c2df6864 SHA-1: 3d2a2fb30904964c1482f363e53e5ae20c0711a2 SHA-256: 7911c263c04dd9b6a0bd31868e7141fa98e4b65836f4c6dc6777430ffec02492
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c654b006ef---kitibobigoramusizow.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/31971332371.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/kobebarotejudixo.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/55639617884.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad661b795---paxolifiruzipajawuwisor.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/ximudekilutunago.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/23080888236.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/rikadafawilajud.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/58453682539.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/17643985063.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af7c114b51---66820290305.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/69814563810.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/8576055075.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/38453019371.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7324a1da52---34284646858.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae669ad89b---redogesiruk.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec834eb160---modivir.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021516441455815.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/xurexa.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/48759321981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hp+elite+x3+lap+dock+manualPDF 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_off00015644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15644 10864 bytes
SHA-256: 1684fa9f3e9d361d6714d3ce0a1ab6a24ed167c8c986a3499850ae951ef92b83
font_01_sfnt_off00016f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F47 22088 bytes
SHA-256: 2a044e039d0f590d780210eb1e1a5101009db36b7c0667f9fe2b02ab3957ad0a
font_02_sfnt_off0001a892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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