Malicious PDF — malware analysis report

Static analysis result for SHA-256 2930406316ccdcc6…

MALICIOUS

PDF

76.4 KB Created: 2021-06-15 18:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: eb023288ef90793834572b9610bddca0 SHA-1: 6063121bc4bfb535dc58c92a653ed6b1549a3620 SHA-256: 2930406316ccdcc6ab1bfe36040359732ffe4c766167b61e89f74d1dea5c4930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to free book downloads, indicating a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=marathi+books+to+read+free+download+pdf PDF link annotation
    • http://arch-teh.com/pic/userfile/39593191026.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/656dc5086750f9935d1b9d18acde81cc/61140505030.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090041ca985b---xotek.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b9d5e22c---kajalilazebem.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d71cca26---50713726236.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/45445472137.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/21301918027.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f8db437360b5697c71789a2e6ac0c750/39899808396.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/433psp4rcg77ki463u058d783n/5941266361.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/n72egdqfm6m1s0c13fuc3k3r1h/68756378734.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb3f8368a---71727408313.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/67f485bb9afb7b7ac5e2db7d9233b433/50309112439.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lijemupabozunizososinuji.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080487c13f89---badinafap.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c70dbc3fb---kibefonuzokad.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/o24u27tmpt58n7ef1cak0cn5lk/lebimakitojetapizatej.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a8598ebb---71321660010.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f881ed8b---40377427914.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5428 bytes
SHA-256: ab93b8ea8c59dbd68e8ae8a2b8609d3c518131fd9973bb3a03aa8015a280f1ec
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10584 bytes
SHA-256: 5f05afa6a24f81e3dcf80602a8e9fba41dbc1519a202ce01d7aeeb4f33989a14

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