Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf212569ad43c46…

MALICIOUS

PDF

84.0 KB Created: 2021-08-13 16:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acaff486ee9850f2214afd33b14b8543 SHA-1: 6094504f5a63f54f85c3ea42b6dd09aa4978aac5 SHA-256: aaf212569ad43c4614205e5ec19480500a319a0c09f311337d74e5dd004c6e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://moscowballet.ru/userfiles/file/51515496053.pdf
    • http://ttworld.hu/uploads/content_files/files/97020916965.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b31b5e4a156568a863c77f2db3f143ab/22296756073.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/86990913074.pdf
    • http://e-district.org/userfiles/file/1383490615.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a8cf973977cb7292fae485b2602211c4/josijusibegenimidatiraj.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d82bc2ab75dae40a97858c94acfac87e/nurutenan.pdf
    • https://blugarden.eu/file/minawe.pdf
    • http://vce34.ru/attachments/file/vufitilinusugomumetubutej.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/86352482362.pdf
    • https://myphi.biz/nbloom/fckuploads/file/ridemisif.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89c568a82---72679748559.pdf
    • https://ajansnigde.com/resimler/files/47257932056.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899b218c30---leratonufopugifomozejeru.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae63381a196---53872310325.pdf
    • http://kapsalonvogue.nl/files/file/59838154590.pdf
    • https://e-uchebnici.com/img/file/rawigazuxetitudo.pdf
    • http://demirlermetal.com/resimler/files/tikegu.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/700842a69347608982e35be7617a302e/rumutiwujipidin.pdf
    • https://vieclamxaydung24h.com/upload/files/jadipivulelulolugupon.pdf
    • https://prestinieurope.ch/userfiles/files/48337434618.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=go+karts+for+cheap
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 16792 bytes
font_01_sfnt_off0000f6b4.bin
75b7b7c7aff185a3d253b571cc64b51c8590d9290f457b05c9a0b6b6ac1d7fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 16560 bytes
font_02_sfnt_off000121d0.bin
049a25933905d553e408f7f037eb78dffd9522cebc6ba26051723331e4aa20b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 10468 bytes
font_03_sfnt_off000139ca.bin
72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 1684 bytes