Malicious PDF — malware analysis report

Static analysis result for SHA-256 a939b8e641183fad…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 04:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a80060cc5b0a26419498d45ef3ec20c7 SHA-1: f0ca47819d2f12117ebedcd448c41a2cfededaa4 SHA-256: a939b8e641183fad024bab42eb9942805db87d45f37556265ae3c9464b44f1ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=gta+v+offline+money+cheat+code PDF link annotation
    • http://agapetown.net/ckfinder/userfiles/files/nudufo.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/polasegawatatijinid.pdfIn PDF document text
    • http://mopron.ru/upload/files/fopitofexid.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/winisap.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jamejewisemugirowigeru.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2200799d---kuriderovosuf.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb72f2e32d---82562759470.pdfIn PDF document text
    • http://upakuika.com/img/file/mapisorawedidera.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nepipakuwatubet.pdfIn PDF document text
    • https://atlantidegattico.it/file/7226899230.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/19549220748.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/divereguvajisemafutupojil.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25534420131.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bejoxomisawudeparobefojit.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/98386037146.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/pelironazixude.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/sixito.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2aff4082---50640956598.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8c91sgqub6b3o00hf8gfjjqbms/lidowixek.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_47BCBEF79995C6CC.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vewafawofaj.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/faxekaboxura.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/44019973837.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/96698567036.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_off0000b7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C2 10692 bytes
SHA-256: 9fdcf2f5c126efd266201e1912a0edad32010c212152c4696510c5c0592c4880
font_01_sfnt_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16700 bytes
SHA-256: 6466a8005d94b23f04e49ff1ba2e6c842b33d2ec1927759f205fe04ed2d97e10

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