Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d03d01ea391b813…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 06:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6a90c2942cc09e97599c9081e26bbbef SHA-1: 1b1d498b2c0c94e44170516bd54dad150373f989 SHA-256: 7d03d01ea391b81396bb56553f52c32830773303447e3ffe8897bea5ca7fd6bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The PDF structure and the nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mirutte.com/newsfiles/files/vebutamize.pdf In PDF document text
    • https://duel.pl/userfiles/file/jikubamomokakamo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f31d3b2f52ff209214cdf63dba9393dc/guveruvezikixoxusekalolur.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/mosolagaj.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/78166382910.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/lunada.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/26229641777.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/71241029017.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/21816351081.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eibfo9b6qihjdlod4saulj73qn/dumoxetenutoko.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/57908098965.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemolur.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/81183001963.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/gufuno.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7nteaeh6742seacmvf52k77cc5/gisesodijagefew.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/56227968622.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/98946321567.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/19687562074.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fofet.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/lomex.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/gelibo.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///mamagamobiso.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/43199775774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=speed+post+bhopal+trackingPDF 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_off0000b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 16256 bytes
SHA-256: cb5a21d3cb118d2dca3abff1a55a9e9bd3a3a6194ef89c790be81936f0f0aa9e
font_02_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 11100 bytes
SHA-256: dbbab021d270f78e7b7c033864a4c0a83b66235905e4ca3c6ae3456b51d6d920