Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f09c1c85c33b75…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 07:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c110dc0c2021534a2ae4c69d819bf18a SHA-1: 8159ac4f8a55048b8405ce17597292ffc76321be SHA-256: 42f09c1c85c33b758089d5a5d932caa41e15b654f615a9f3ef1982e6cde4eba4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9448

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3c226a5d8---kumof.pdf In PDF document text
    • https://thucphamtruongxanh.com/Upload/files/70516473978.pdfIn PDF document text
    • http://ave-france.com/pics/files/76590538842.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/wemepumiludovamatoso.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/56332786511.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/88028650045.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/tagipite.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f8636875d57b19c2cb74d5e20a8cf130/wasifubojuwuxidud.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/46345511676.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e55f7d0380---fizipavaweroras.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/63000203630.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/50926129011.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1998575a---xirotine.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/xojenewevovekoviligodu.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/menajikev.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/sujezo.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210907031548.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/17737819885.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/4619805745.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400825aa198---sinitebokikewi.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/8834099394.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b88f216312---12364087258.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/xelujilewosazodidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+find+phone+androidPDF link annotation
    • 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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 10392 bytes
SHA-256: 6eb501259689db6c1b22e9df8240950dd0bf239b24c8af541aaeefd9a328a872
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 17620 bytes
SHA-256: ed24de4b8f36e3b56c5828a1be9de3fb546786f25f0ef80c1e4859b3536114ab