Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2601643cb07580f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 23:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9855b67d94fe39040f5c5411f6220a90 SHA-1: 8306da7839abeeaf823863b67a9e4242912c688a SHA-256: e2601643cb07580fe490e5013bdd39fc5113bbf1f7b18bda6c45ec2fdc2661bc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i3ipo6l66n8iv5nq2n5d08tg8e/nalozapijipulug.pdf In PDF document text
    • http://www.gabrielamaciel.net/images/content/file/92545338213.pdfIn PDF document text
    • http://drtamerturan.com/file/tuboxo.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/bililopesoporugavi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kupuninajulasox.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210625172429889512ixdx4.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a46e5c6045597878261bab06b5b72d0a/46455534798.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/zirosavowasikatul.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/98216097989.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/meka12r096ppbqcdv61td80927/kewigomuvome.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a6df4100---99710827933.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12508cb0e---74610453867.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/nozidu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/benexapusovikavotenapab.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4a7329a1---20151255033.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/34edccbb6b20d617fdc34b7445412a02/8698172591.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/67810997524.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/gulixi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/noguzi.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/63761978869.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a445441dac3---60375467562.pdfIn PDF document text
    • http://fructusartis.com/i/File/jelazugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=english+guide+for+class+10+pdf+new+syllabusPDF 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_off0000bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 11396 bytes
SHA-256: a0e644e03a3d11dd9ac3f956b82cc16ef8217dd9307b6f7b36df13ce58ef10ca
font_01_sfnt_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16784 bytes
SHA-256: cc143df0e96e73e7d41d314d3dee62b562c0f54e152c7c70354c6a14928a9d3e

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