Malicious PDF — malware analysis report

Static analysis result for SHA-256 916a7d7200343db2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 11:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b22b75ee114703ba90dce1eeee77d86 SHA-1: 4efe373f4cdb5f3ee117ce63bb73359c6ab1367a SHA-256: 916a7d7200343db219dc8f8902472550cbe11880d3b06d931b6e89b5cf12d600
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many hosted on compromised CMS upload directories, suggests a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or fake billing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=statement+of+the+problem+format+pdf PDF link annotation
    • https://evermoral.hk/upload/file/1628665383.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16120408d2266b---65883564566.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/kanumaxovodevazojomud.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608718c3db178---51325857436.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd0755ff0---51272141699.pdfIn PDF document text
    • http://lucann.com/Upload/file/felefaraliligidoneguvan.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a608478bd90---nuvuxafamexolebekevizo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08adb47a58---14093773571.pdfIn PDF document text
    • https://basisnomor.com/contents/files/69101015694.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nenevasuxuj.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/lumajonitekigudugarubizo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607151505c32b---81516550843.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/jufatulesomojefavu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16110dd3433eb4---91946294127.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/pofodu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/kapomeloxezajuniz.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fusipuwonano.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/65720349754.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/sorev.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd115b1af6---70035712351.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/mupajowo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/59143447911.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10720 bytes
SHA-256: 56343011eb5ed6b09a1eb03ec32f2bb8300d078ec0dc60f105320ceaad8484d1
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 18180 bytes
SHA-256: 1c9d34b000bac6ed0667652c274927b0f72eacb64cd03a29dbd527659611cac6
font_02_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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