Malicious PDF — malware analysis report

Static analysis result for SHA-256 801aaafa014b231d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 12:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22d93a0a2ac8e152d69c493f2aaa0e74 SHA-1: 5ae2d2565921dcc02ff880e4d04ab2d12bf45f8f SHA-256: 801aaafa014b231d0457e7248debddc70fd38f7f90e42c988a64f8b12edd67ae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to exploit users by directing them to malicious content.

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://arc-en-cielproduce.com/ckfinder/userfiles/files/41672231418.pdf In PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/6ab1b15a5ba45e4d2ef6857389af38ac/93809583162.pdfIn PDF document text
    • https://termocasasrl.com/file/nobedoguviluxusugalixupe.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/zapesopumojufozetipi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/90a8c25b58ef62885a83d229079b0c3b/6375518851.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/kiwerefefobivajupox.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/5294809268.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/sizuxesetuwelemonotada.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efd4c28160ccf82d7348a786ee69c45a/6084341507.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e4t2qqnso791j13gf61ssk827o/puritalupagik.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096ebd981883---64305974756.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/43501264872.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/kugowurexelezawomimub.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74c57e944---menimiworefitojoterawepif.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/kofegawaketabod.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/keguzanalaj.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/mozofusesopedezovipupoko.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1rhc6kb9mph8epf7vt8ekikjpo/40387573100.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/65bd77adoq02d0g9hfcc4oq1s4/56069182413.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/25387473218.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/597372b6c267d2139125f27df7764795/14729748819.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/3356898177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chemical+bonding+worksheet+2PDF 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 11284 bytes
SHA-256: 6027ed7529b96ad1e0203ddc206b33544f64f1b4bf64e82b46d5c9a5d2e24312
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 18032 bytes
SHA-256: 83bdcfa432e5938b20dad94a6957051e1e4deac82090cad01532a1e89f10d421
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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