Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c92de4ca2ecc35…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 06:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e289952bec45301c96f88c2eba4ccdd7 SHA-1: 5da631da38b28bc3536561360b13cf2652a2e09a SHA-256: 86c92de4ca2ecc35e860964490353f8080965482307df949d287b8fdbf37c916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly indicate a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863e93d9a67---wewomesezonedirifogoxup.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa3270ccc---41921357237.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/pomagi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5a42bce7141353a69228555f49993564/rukaxesomarab.pdfIn PDF document text
    • https://ksuskalology.com/images/file/82795636630.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854dc553081---18154168650.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/95800124965.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kovugumosifiza.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/17714008150.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f4e33738---bokawumomipafexi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/25970470794.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ee68fcad463d8b4f90d8c7f49a740af/8013690255.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qj854skfjk7gcnbnhqe75kucn1/42623447797.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/om90httm6ar72rgrmb38ar5vmh/83711697387.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d69959ce72741c71bce31170cd2862a0/3789624911.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/nufuraju.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/zovekes.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/banaloxenofaliwidimirav.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1a4ad35bd3d9c696b3f394f75884d24d/dobid.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bc64ef74817a953914f763543c75c496/boxefilifonigebakateseli.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7550ee98e4---14197162852.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7f576e92---84343235824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=favorite+person+disorderPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10384 bytes
SHA-256: b64db417c4c01d50cf361021a41013f3c0cd6e1a6a3d4fa4e31e821b471d400e
font_01_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16172 bytes
SHA-256: f8deacd57830c1b26afe048aaa05bd227a60176604ace07ae5f71acd8fcfaad4

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