Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead4be69930b2add…

MALICIOUS

PDF

92.1 KB Created: 2021-07-23 19:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32727bcc26d499353f3e04c81efc50b2 SHA-1: ed15f282695e26eba1be0395743974e296ebb9a3 SHA-256: ead4be69930b2add197223dae6b6246718d1c200c5501fa1890646cf01b72093
176 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, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The PDF contains numerous URLs, many of which are hosted on potentially compromised websites or disposable domains, suggesting a phishing or malware distribution lure. No scripts were extracted, but the overall structure and heuristic firings point to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/xinogodosefebuli.pdf In PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/76890671566.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/rn8mjf9v5t5j370ebvmekcrcsu/11229297553.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0948094b3---zexixavililakur.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b681cb913a---12619433026.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vanisegis.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f2d68b6d1---92834847133.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/virebuwux.pdfIn PDF document text
    • https://ridersshop.it/file/55966763898.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/43796217500.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/mazipuxajibogarimu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/d4nsol022fctgohfbim9bqf2qj/96692928534.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dbb71481---pukoxob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/bumujebaberefegan.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/68701484313.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/9797134934.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/kewunitaxejuva.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/nafikix.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xawosutigevifawalafafowu.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/walukesozagiwatebupevi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609781b8010a8---didenepavadorem.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/remepuxozaniruxis.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/erpnvi2es2qapm4v73r4vqpic6/vusejudevipemuzipavafop.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/59927856048.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c7d99547666409e436d6c483ecf99e2a/semalupazadebigiwepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=student+exploration+weathering+gizmo+answer+key+activity+bPDF 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_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 11796 bytes
SHA-256: ec3209616abe197666714801d5dc34e3d153c0f122c06b2710575735ae21aca8
font_01_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 17224 bytes
SHA-256: f899969b99cb3a53b26611c3b76a4e9e3aa74bb9586cf7205f41b64d60275b43

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