Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c3362c4c147466…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 07:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09f63422687a6f73701f0ee96f187051 SHA-1: 7600367aaf455a1cd90591371c606c7c88f919f3 SHA-256: 72c3362c4c14746688462955d72a8f3839c27943656ff3a6447ac7a0261b1f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress upload storage and other disposable hosting. The presence of numerous external URIs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=hotstar+apk+free+download+latest+version PDF link annotation
    • https://malmospelmanslag.se/userfiles/file/74530653448.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/19099937913.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/jewojijofesawijazekiw.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/malikebemegukamu.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/fofevenizevusagojamiwi.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/27139239408.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/rotimepovojofijuzurifasu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e77a87e9---57878809881.pdfIn PDF document text
    • http://zerosquareonline.com/file/kuderawuxujuner.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/82504044582.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db24d777b---48982811784.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/vutelodojawe.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/jajunol.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907095005_03pmff.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qgfadmd8inhcu391a23kvv8dj8/bonezopikeke.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/ximobi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903000709.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/sapusetisobukitibifisaxu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161465e7e7eb51---39517094619.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/tagijazutajomudo.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/bafozivazalutuwuxofad.pdfIn PDF document text
    • https://pokereshop.cz/data/file/juwijemipumumofewig.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 18788 bytes
SHA-256: 34436a3490f97364d629d04f193d4b021a4bf7df52f91e47b8b7466fffc74382
font_01_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 10728 bytes
SHA-256: 0238266cc08fb4766f562ca17816f7f551e499b99699424ffd3484582b1815eb