Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae107c59836c52f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 16:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae0368b0e917cf11d14362f9c5d698eb SHA-1: 7c48161fd2e6c115cf08fc49c955609ca5463957 SHA-256: dae107c59836c52f9348581bced0b595ad5e4a1f2c1dd813917f95808cd2a442
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely used for SEO poisoning or to host phishing pages. ClamAV detection and ML classification confirm its malicious nature, with the primary attack pattern being the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d719edee7f4---muvomedorubobeler.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/fimavibalamo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4ee0b480d1cab27ba29b0cf27fb533d8/fetewusawesopugatogug.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/nevosu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/watejo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb4355d21a---wobemabix.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/40131383433.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b15c0e6505---sowimosawa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2cd8a28076c598d97c012ec573f7355b/89314685818.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hj9jpo6452fgfeefvjd312n858/703399579.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1106sq1cooh6jd4hu0mh65o8i7/gukunituzasinorir.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/oaeik5sg1q8avndddpm62q9dcm/24725142164.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wemibonolovo.pdfIn PDF document text
    • http://keacg.com/upload/files/30577494873.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tifafisi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rjgltllcf6psml0lg1f0kg1h14/33369835999.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/wezolop.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a05a1590---88083657937.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/79882069072.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3b2d4f564e321649b78483524adb89e2/57244562667.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/6431749227.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/savebetibigutexuz.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/nefonumovux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=numeros+romanos+pdf+1+100PDF 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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10676 bytes
SHA-256: be00cf36ecc86c805d7ec2e03caf105a594c19696da2bc83ef2e8bd4a57b6f4d
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 18776 bytes
SHA-256: 06b2bf45d873b482a1ead4f2ba2d2f66362ba95c0ac8db1be183992c3f3dc8f2

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