Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab71f0ec31e48f6c…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 02:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2161a278adf7f8478730affd0cc356f SHA-1: 1f90ec647c9c1421ca89fd1f8f32baf04344efff SHA-256: ab71f0ec31e48f6c530bf150ad5602f1afafc894b0822a65fd88a8cbfedc4393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, and the structure suggests it's a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://thaoduocquyhiem.com/userfiles/image/file/xijudogi.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d39ce368a---48059867613.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb2caadc6---lunezudewipero.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8b30798a---jogapibegewibajeguk.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/giduvedotevinalevux.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3ce6d5486447c9e90737695fe3e6110f/mesol.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9c69391a64b60b098b4f978cc89ab9be/mobimagukotepuwowabarew.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/79248077746.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979ea6ab996---87606340255.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kegukenupirudabofi.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/95886592206.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/38458211736.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bacae0b988c---sudewiwikapa.pdfIn PDF document text
    • https://mfdesign.hu/files/file/biwasavinavaz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb00226a7---wuwalasosizibulesefaloz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d77988c6acacfeb8f9c3301d3cde0157/73258419449.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cec3433e8---viwizoluligijuzaxabitijo.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/8544695901.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4a74286b---sufewapasesinufemikanewis.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/golonaxexezajidoro.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6569dc24f3---47753161607.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rco7r35d2tlm3lc4e66tfgunl8/biwatotujes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=addition-elimination+reactions+of+aldehydes+and+ketones+with+2+4-dinitrophenylhydrazinePDF 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_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 17276 bytes
SHA-256: 27b49981ffbff4b296c81ab77a4dabefd7d78e9995fee675c3f30c683c7496fa
font_01_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 11448 bytes
SHA-256: 2271cff98e0ef67c4f68f11d38a14761d65563c9c5b5092e40076f5692919668
font_02_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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