Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf89dd9e734bc0f…

MALICIOUS

PDF

105.5 KB Created: 2021-07-28 04:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42a25f3906025d1b97ee707e54bdaeff SHA-1: a9ee35a8d30ef86ced4efe0c518d0b20fb4410c7 SHA-256: 2bf89dd9e734bc0f75f7af09c28e73c0141b49914d330ea5f73cec0fdc83f688
172 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. These findings, combined with ML and ClamAV detections, strongly indicate a malicious intent, likely to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vuoncotichdep.com/upload/files/7184490498.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/225b9a70495884c2e172202132d26984/rakasarun.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e51948fa5c9dad0086d47100aece34c8/99435689331.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/344279698.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c5764535---48207998131.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/72053707405.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2d74dd9f5870cb100ca63479ab1a2da7/55800774486.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6ce882e7---7334398369.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7be7ad412a3a746d343c47dbcf26119f/27021070132.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53c6321a0---81259533030.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609720349d494---223552101.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/60516441233.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607719a4b64f7---robumewakubuxelezakupefi.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/88448164838.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/038667861f2e0231aa21e9215a6d9ded/pofirula.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/21840919756.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3b7bf0e996e144fb313337671db829fa/medog.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/fonoja.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/2753908883.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d34673adf4c5eae0767e01c8002737b5/55757252537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=job+offer+letter+template+south+africaPDF 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_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 17832 bytes
SHA-256: 7afb4367409a12f94a6f203378dcf02651c01715f74202183fd1040e8c6198a0
font_01_sfnt_off0001676d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676D 10872 bytes
SHA-256: 6410e84e6a232cb318e3eefe78d73f72184db10350ca80794664a1176aeeb8bf
font_02_sfnt_off00018060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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