Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bafcb2b0182e66…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 03:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3784e22ba62cdee3ae7f40ead7f7a250 SHA-1: 095b73c75435df918e55c0e57ece14452f8e1f03 SHA-256: 69bafcb2b0182e66d34f99532ee4d244f573738455cccb8235b72da54ee13c89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the malformed stream length and compromised upload links indicate exploitation or malicious content delivery is likely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://amatnieks.lv/pictures/image/dokupevav.pdf In PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18436481267.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e3798e16760a0e56bd8147c003ecd775/zatobufewokobirisow.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/91760407274.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/65927169949.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/70759028301.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/77203561469.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d34da18b82924570cd98a77356d9187f/46985061593.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141630de467b---2873459974.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/58255133871.pdfIn PDF document text
    • https://eternalbliss.net/file/13094570642.pdfIn PDF document text
    • http://receptlap.hu/files/daputidebibotarunedigisad.pdfIn PDF document text
    • http://harlit.com/upfiles/file/tebak.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kilimivurog.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/lidipafukekikebomax.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81615846541.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gosiko.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e1169ab96c075f07a25c049697149b4f/mewegoximevogolirovubel.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/padivizu.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091916551653.pdfIn PDF document text
    • http://poliinc.com/upload/files/nufiwujetoz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3l8ktlitc5rnr8eptltpkadg14/kilupokabidiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mine+blocks+2PDF 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_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 15936 bytes
SHA-256: 4c85a0f62bf80e29f834ac81c1a04d6c06dc2f183295cbecbb7cb4c8d3194900
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 10208 bytes
SHA-256: 1de183c973597ac1f4acefffe9e17d3bafdee99dd6cb923d6bea4d8b41a4c510
font_02_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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