Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8abca94d96f22e…

MALICIOUS

PDF

81.9 KB Created: 2021-08-09 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4df90780645179dbddf2817d426160d SHA-1: 69cf168f039992a5cbf0b209c8362ee6f73ab8d7 SHA-256: 4a8abca94d96f22e44d5d0743174032fde2221e7d43418375e95ed233f028a2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217ed627ad---bexatofatifeloro.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/acd087401ec5b17af35f4f2a059fd927/12570697172.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/14243316293.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce7c350fb1---41184396326.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/31424367327.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/78b27b5d1d6cf959d81b0f3655ef0d20/93573802829.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9flsvuv8pegpndac3v2fpgqgti/gegolesajivog.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ralogazojadilawenibofa.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3a807b8e1f04b76f5b2ad1adbc392bc4/ronukof.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r2iaahcdurvmaeu82uu4740slm/bizoxobexopesoz.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/tujorogagodew.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/scpk16tfs4ot8sh8autcovm8l5/74163191647.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/falodidanurododunofug.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc1935ba57---xowifevonutufe.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/56bdbeb5abc6943774dc25d8c0a3430a/14821986321.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/luxizenumokur.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/pekaxuruzabaziko.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/kozoz.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kiluluguxuj.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/47105178877.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/of8934jm11onjmufl3ssq9kodp/7241270728.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dtoskkvfei3l8butcm89kmbh5q/70514316819.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2ag348lmc79bmepasmnnvad31v/3809027970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+off+wifi+on+dell+latitude+7480PDF 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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 19268 bytes
SHA-256: dff3e2151d3c609358cfe655d1a124e3dbaf1e18e27c0170ccef7d9adc03ab64
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 10812 bytes
SHA-256: 4d12100fb65e8127ca2f4d7200c5927929e73bf9704c0998f5c18b0bc9b4cba4

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