Malicious PDF — malware analysis report

Static analysis result for SHA-256 b183b77d67151fa5…

MALICIOUS

PDF

94.7 KB Created: 2021-07-07 02:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6da33c57251b2f868edb3cbdec12702 SHA-1: af7530872c3a372d8d9eee161f613574829528a5 SHA-256: b183b77d67151fa53bcbc206f8e42a18bdcf2f5b703be3e7becb916bd254837d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/cec0db547dead70f6a885558b065a474/jaxawipazixosinonowebexep.pdf In PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/bametirasewev.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d955db00bf8786865c75fca51f5cfdcb/boguzunukirakixed.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/nh31g8q6ggijs0a6doj2dnfr62/sikorevem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb981d2ef2---7398711064.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3oppprqvjhdmorbbb8d5cab4n5/tukofo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lkclgel8bv0hqikjdvdvbj4458/mowigiragisoguleseb.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764d6a1a255---86071798863.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nel54926mcndgn39b5jkk7rvj0/73399400742.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/mudufujomunulotaziji.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092956af3240---85830622644.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/43533184113.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/87553100044.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/bufumaga.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/14210143448.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/tilaboxemolo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/75240079403.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uoln1r6aeh8su8ofcepietofkq/lapasina.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/94275530100.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/59038412687.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/rifomotefegifogo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/natajonirakoxodaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=caliban+the+tempest+character+analysisPDF 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_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 10804 bytes
SHA-256: 9ac00fcd8627810720498267702a135eaa0c41a1cdb08b2bc73dd026489b7f99
font_02_sfnt_off00013e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E91 17484 bytes
SHA-256: 21ad8bc2af6321eee2ba76134cfbaf94b6473365c47e5ceb79babbb227cea130

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