Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d8c957b8ca4027…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 02:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b940553c9c3b599c2ffcb9db0f7b137c SHA-1: 84e6986665c211b29d4f3a40800db03edf5ac8c1 SHA-256: 32d8c957b8ca40272afb073d9a7f197846536c15c4966b9ae104ff9bcd24dba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://brmxn.com/userfiles/file/20210805000908_nn3hsn.pdf In PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/numinojolerafawaxuter.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qeenslcpl5sh9p937oqn0n4up2/27773406437.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a661ed063da---zilasuzox.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/vidifamatuvak.pdfIn PDF document text
    • http://halmar.info/userfiles/file/xuwuvurugatedelu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/07v698aed1lah3eudr9r767176/fiduworejivuvogon.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c3cbef29---wajejolopebubuvonerimusup.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210620_8FBCFF6C15D6DA9E.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/jefuxolonised.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/olh4n5bgqqjdtvia6fsq2bjhd4/39917888721.pdfIn PDF document text
    • http://congluc.com/upload/files/dizikeligopu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c77e3a820efb46079f120d3ee6421396/kozunilinorivusewiwoji.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/jixozaguponutalev.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/mopasisivibuxirikogonuz.pdfIn PDF document text
    • http://15881588.com/ckupload/files/75488782022.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd386248e6b---wosawakaximalopukakufib.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8ea17707b4fdcc2279e57eef82e8d571/94241464588.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac861f8de---jolunupozu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/66538312726.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/savk85vi5769iu95ippl6bvfr6/ditisefokoru.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098450617406---rowopubunoti.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/20048983902.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5589667e---38464510106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+area+of+a+circle+inscribed+in+an+equilateral+triangle+is+154+cm2PDF 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 11656 bytes
SHA-256: d9994adb0342f8dfd11b1e8d952b4cc8ad6a1672579a2188f9c4e673fb1628da
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 20192 bytes
SHA-256: 054da79327f1faac88977d8701715abbc76c5babef9d44da5aa012dd4b7d72af

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