Malicious PDF — malware analysis report

Static analysis result for SHA-256 9331848bbf5762b2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 106bf691073b725528cd630cd22d2278 SHA-1: db565a6919ab786eaa63aa5a57456bf491372d8f SHA-256: 9331848bbf5762b2d5d471e0fe7bb6b4f523ecb326719ee63ad95e410e44d1d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically a phishing or trojan threat. The PDF contains a link farm pointing to multiple unknown domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alessandrobelleseveterinario.eu/userfiles/files/7083967139.pdf In PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210904152226.pdfIn PDF document text
    • https://codecs.ro/images/file/65525631090.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/muviburakutuzeb.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/fivoxumamepipejopaw.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/fezovamoba.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/jefugitup.pdfIn PDF document text
    • http://hkalc.com/userfiles/65170927999.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/87039053184.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/lerimozexo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/36556068801.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/68646098445.pdfIn PDF document text
    • http://esteel.my/userfiles/file/ruguw.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/junapo.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/lugeputeda.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a0b4550bc2fa7c53b3806fa6573b4af6/libagizegaze.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613668ee93a53---zusamufaxevujafuditi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/38e75cd18719886487d5bd89fe492217/18464846782.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/jupusojuwuninoxigif.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/zufadogominewu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/48991257184.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f47823c4---29766131032.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/76832667145.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/59419020185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=famoid+instagram+likesPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10660 bytes
SHA-256: f35d27d78414447d7aca39a190a424ca690ef3c04873d21a122fd67b70b51341
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 17032 bytes
SHA-256: 0e936f992cab301c32d4b0ca19da5dabf407275322f7a5012baeb4f802dd5a2f

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