Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9b25275dfd8e8c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 16:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abc42c6d4f1c11e1e41d44f7ee172b01 SHA-1: 3f79045fe631d1f5e66ec3d2c3385ffff2cf5989 SHA-256: ad9b25275dfd8e8c891fbaa82aaada1b3a1cbe882596de55c666780f13aab987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/701325a9541fec513dee4d59dbb00655/dabuvuw.pdf In PDF document text
    • https://arzhosting.com/calisma2/files/uploads/10339084374.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xikosojokezodib.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210629025924.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/litodipuwalijekulofubowaz.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/93276525065.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/db40269fbd236aa21c4442abc68560ab/jumapim.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/32029227043.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/vuzavatipatadunujikekigeg.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/58fdc7317ed7cac50e0120ab768c78b0/xoletoriwarida.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf34da625614a16a629e85a3465c6d49/tazubejuleja.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/05qg2gkdfgt6i66lb6kq1p13t0/sukasu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/795ln0ef60cp6sbuobrvtsop42/devenesefipufozaxet.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/vabokulesa.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/39193039505.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/riwexurukimitunekonavoro.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0b709167920a91c20ff0df165823ba9d/bidipibuzibet.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/95677006664.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff744a733f---42311364047.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/95394394878.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/usk9cibap54vvdtpnv209trftc/rasulebusekalifezu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84d9b443d---zugizujokipegux.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47bb3204eb---zonozuwewawixejimibufipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=values+vocabulary+list+pdfPDF 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_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 10896 bytes
SHA-256: 5eff575d04bf5784e732767d931630b2541b046f607df3b4e8f03e57c8b230f9
font_01_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 18140 bytes
SHA-256: 54b6f168d4d9bc9f6b45306ed4aa45bbeb660d9b2920c4af32719cdb65f0e263

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