Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a799b54a6d6143…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 14:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5679f783225174a7a1e40584dc1118d7 SHA-1: ad926445c501292d98b409ee4c0cdf24a66bd714 SHA-256: 38a799b54a6d614373d0b52e97828230f778412cbb46a3180bb109eff6605bc3
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 by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous links pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and a high number of distinct hosts associated with these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mosvag.ru/img/lib/file/77545642902.pdf In PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/16128870178.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/33f582dr16ub44pgg7oubvvtl6/16722793784.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/99925688161.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/mijusojuwasufuzi.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/vukedatinewifovefimojineg.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/27662780116.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/namajabuxixid.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/xinesi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/40a079aa8ec3a9ed2a5f7362946909c0/munek.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tdgvbn119j6luq6f12ao47upg8/5851508530.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/86da41b6b3a40a2a1e612b6e89351244/24938233922.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7033411b42---gazonikexoresil.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/bovusuxekarolonoselobevo.pdfIn PDF document text
    • http://sentai.cc/data/file/20210904_085502_691.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/dituvavaf.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zejunarigudofeduja.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55cb98424---runinugen.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9b7bb4177270dbcb6ea5a706459e4f11/soruzozebuxi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb484a2fc5---womedoduneloxaditom.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e97bd965fb8851323b5c487f3ee8bff5/baweba.pdfIn PDF document text
    • http://vtaky.sk/media/file/95014133382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=finding+unknown+angle+measures+worksheet+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 11200 bytes
SHA-256: c680a48b949dc35d3a227b6360e20f548fb695ef2dcb780c56a3549517667e95
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 18544 bytes
SHA-256: 2c6f7621ba11611a0f0fcd7eab1459dfe9297889954ab8185846aeb41a3dbd51

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