Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a72334f8537a63f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 07:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc479493d6e7c42ed289ca14b97e278a SHA-1: d1bf47e3af9a1317a8857f4d1cd2001bee7ff848 SHA-256: 0a72334f8537a63fb588b61b71b31aa04b0dbe02962a369a78a299aae3e3beb3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abisspaandboutique.com/nbloom/fckuploads/file/57623448698.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613392ea74606---viwapimilitoxonadekiliv.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3465365440.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/036ae1fad6edec191e19c729f389c6b6/14864392904.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/79409830776.pdfIn PDF document text
    • http://i-physiology.ru/upload/taxipitanivigux.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/rudikifoxinumovufa.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/5940244389.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc2aa5bae---wufoverevunewil.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140408d7f157---mopamixi.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/94391042341.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/78167de0214e9820c467f2b92b47b58a/31283197380.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/58663217051.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/70756235230.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613082df551f4---gavomirifisisopaket.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/wasoga.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/57606052388.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/sexutuzi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/wigopokil.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf514f8b8---xegawosinugubojanak.pdfIn PDF document text
    • http://kesifveotesi.com/files/50000607659.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384727aadf8---mubexetovope.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/60537502347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=2+player+nes+gamesPDF 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_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 16292 bytes
SHA-256: 50a8e1c1576c0e5042ec7e1819c5c7ca64854d2c11ad462e54fee441284251d0
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 10420 bytes
SHA-256: e62197a9bbe6b4bc631e206e0ecf871aaddefdeef9f6a6a268423c86b3b35dd1
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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