Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6cc1381f92d90f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 06:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e301ca9a8818479c132bab39df07f88 SHA-1: 31c43e5d7952a46e0f32c05bdbce10dd4105ac8a SHA-256: 3a6cc1381f92d90f31d934b04a45bb496a5cad20152eb877b0184771e2eca895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the presence of PDF-specific heuristics and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://garglob.ru/uplcv?utm_term=pembelahan+dan+blastulasi+pdf PDF link annotation
    • https://digiconelectronics.com/media/lejubokuvolavufe.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fad5794a5da9054692a6a400bb75ec49/pidokiwub.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/74787574109.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8cf4009fb74815284a8cf66a8f8f9613/70290584717.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jazubetox.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/nesafirimeme.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/c8jj3e9r3evgrhe8rbcabmeva1/kopofikotobivuduvogalek.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcff47a3162---jorosijavoxolul.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/varosepi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/rokibobebe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e3f707afc242e39baf3cec592956b3b4/42181251822.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902071552.pdfIn PDF document text
    • http://abpaluso.com/upload/file/banurunimigagize.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56e0d16f5---78193758794.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/pususivibunapeviwux.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/wolurupekabafusojoze.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/54e2c13f362b81e0ea590bda6ebe4120/42481641648.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/28a9772478159f18735879b8cee6ac19/zovesuvamobomagufenatexu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a41bc73415b87a14813703e4b7abb5d7/wogujaxokedebugosujemowif.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609546ca43913---jutigiwovigekilawakeb.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/17635436737.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/582d37db19b12306c9ebf5c3c4f3de23/tenamirorebanulositeviwu.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/55465203074.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rafuvawobuvumukafil.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/wejexuwudoj.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/lapelowegevobarukewalos.pdfIn 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://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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 10784 bytes
SHA-256: 0b3a9df95181b6bd4210e5db944c90510d89690b7e2046d3151522e54edd702e
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16368 bytes
SHA-256: d228538402d8f971770dbb189c7026408de273eb61691a5d875496feabf44916