Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fb3d5750c3a932…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 21:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8ebfc5e9c44eba6c16846a7090a6b3f SHA-1: a593ae9429decb2b836d15c6510f28213cfd62c4 SHA-256: 06fb3d5750c3a932854cd3b8470195e48d39b0583b45233d6b3f1cab4848306c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=secret+weather+app+for+android PDF link annotation
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/44806508173.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/12878063656.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/revag.pdfIn PDF document text
    • https://gyepracs.budvill.hu/userfiles/files/wopana.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/xulujezumejebutaguxi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb98f112c1---80468659685.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/509b76703255427ed6c8f41a437b2127/1277980116.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3bf7dfe34aa7b3b45ce11caa08e8066/dopobux.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/90066440063.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/92955502970.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/makekiwufabosevageze.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/pebaxiwoligozaweza.pdfIn PDF document text
    • https://ms02bet.net/contents/files/59709003393.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gugaxetese.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/98916913610.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/xevasokatonavavogegut.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/zameterezulo.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/23750035024.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/42731512645.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c31ca3cdfd13067d8042e51fc00a0a63/wojixebixi.pdfIn PDF document text
    • http://turnyras.lt/Files/file/40939651659.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zorevepepepuduwu.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/60690537820.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161329ccc95412---41236295727.pdfIn PDF document text
    • 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_off0000b3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB7 17676 bytes
SHA-256: 4e650ae512068bda24c32a65c0ad5bc410fcb9a31a10e4bc2b03af4374a5bd42
font_02_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 10664 bytes
SHA-256: 4aec52055e7f13a9a70381b108cc063bbd82c27b35fe7a3319c2d3e6ba2cfb1c

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