Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcc222af06bc2b4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 01:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c63b7d08b98e67d7d52ecab8902f5555 SHA-1: c081bc47b542307fc15bc1e2e9257308d3e372b5 SHA-256: 0dcc222af06bc2b4332be97fbc9bc69284dd2339bb62f399982a8ff01b34b463
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. This pattern is commonly used to distribute phishing content or redirect users to sites hosting malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smilepaper.tw/archive/upload/files/52361275936.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e06396544---35206652853.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/papiwev.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a242ea7cc5a---36188261904.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/begozugagof.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/18249060494.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/mijosuwo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/51172387576.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3oaharqfta1ptl5mtqgdt29vl7/rasadilile.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80b967436---donepulibejabimunu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/823aacd37c6b6e23c70d16cef9b15ea4/88413204146.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kumoxitogeje.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vekukixox.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/34156131377.pdfIn PDF document text
    • http://beateromer.com/bilder/file/zoligokosotukasijinuj.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/207922603cc3a07f253f37872c3a2ae6/torota.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d109b9c1---38666042124.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/zuwivazowizozubuxunoliwi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/49796009015.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/savawevebelugo.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210605004413109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lesson+plan+for+maths+in+b+ed+pdfPDF 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_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 18100 bytes
SHA-256: a549f4d9cca442fafb2322d9637438591ad0549cd751ec875b8de9e4e43d9813
font_01_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 10860 bytes
SHA-256: b73b54abc0b5def551c7ad8b3f3d46fb2f53db1643510d034bd6c9db86bfbd3b

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