Malicious PDF — malware analysis report

Static analysis result for SHA-256 9501be81e53aad05…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 01:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4470891559cdfddc99e43fe4ceb0b88 SHA-1: 767b48f873edeb3029a254bc3b9549cfdb5880db SHA-256: 9501be81e53aad0557f7dbecfdb980ecc8b1a1fabc2ecc642229f64aedae1cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point to a common tactic of using documents as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=gba+premium+apk PDF link annotation
    • http://faw-asia.com/image/upload/files/33014840968.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/26226533223.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/romud.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/47786863995.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3305135e---49664333480.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/687e38d52757f24ba534a7e47946f6b3/14921358494.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/42872213769.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/60922485799.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/werokujirelumimatageb.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/69446632150.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/mojowetuzofiz.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/91084429701.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/70951093928.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/49542264616.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/balupeziruw.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/51452911123.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/77011383772.pdfIn PDF document text
    • https://blugarden.eu/file/lepor.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9d62b2448e75727628587a94375b4ea7/gebexug.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/8431037731.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/35272648145.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/7812770845.pdfIn PDF document text
    • http://gapp.fr/medias/files/rifatusumipewinoxezo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/457421d02ad0e6d1ab075fdd180a611d/89102219880.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613386e8b0818---61970079793.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/68078930667.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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 10248 bytes
SHA-256: 8784dcf05d698060c128ffa23d41bbdce7f391dcc99d6fbc49975a7a0505e1b2
font_02_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 18876 bytes
SHA-256: 22c33de154412563855334ddb00e6f98c8c7ce7504e230df83c92890498d4ce2

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