Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f1323603287589…

MALICIOUS

PDF

70.5 KB Created: 2021-05-26 07:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e52140c677fdfcd485e842fa01a69ba1 SHA-1: 5c910e8d99426c5c3585487936cfcf2720e8fd3d SHA-256: a3f1323603287589eb89e631c6a6e11471b9b90e2cae03d839d66ebb38e58342
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' suggests the document may employ deceptive language to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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 https://philabc.ru/uplcv?utm_term=is+a+zippo+lighter+a+good+gift PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879df8302f4---gukegorifeliwobasodoxagaj.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/7581062373.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/4bb96f229fd7ccaf6fbeb2e90c8e5512/18624277536.pdfIn PDF document text
    • https://bursac.net/userfiles/file/dulanojoxurigifagozo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0e5b630a40e0ff43f98092111eec8740/22329939836.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b741ac5bac---wikojegomu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4a7f50266edbccd1d206725ffbccd716/91397758542.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8c37876825acfb73531e47e3fe4fd6b9/sapofepavokekonudafepem.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49f8ea288---6121200729.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd069bbe01---zonuv.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf746901d---42987838457.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xawoxiganoxawalonupeva.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ac1856a9f4e0338e8cf34417f87b7a03/wazijuvesomu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c9736035---35735063508.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef622ff16---61214404027.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d670f832---xoloto.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08818c2a3---87526809851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 5292 bytes
SHA-256: 3c034c46a4c945cd588f8c047a1c1ce08e00eb7f44fdcfa60a1d71127e55fae2
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 10700 bytes
SHA-256: 4a36d7a3fe7670e364952688ff4b4631b59da534605e34a86736b9f8bff743b2

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