Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b60166d5a4b9175…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 10:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a9073d4e8b2a5404610a16f429c3939 SHA-1: 0646d5183ea910b350990476c5a789d22a990357 SHA-256: 8b60166d5a4b91758e9a5603c5e599558867c0e65ee61a7f42c75afd75343891
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing to multiple external PDFs, some hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The document body is unreadable binary data, providing no direct content clues.

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://www.afoa.org.ar/backend/ckfinder/userfiles/files/21757308087.pdf In PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/26745456903.pdfIn PDF document text
    • http://eva.am/files/50b608fd32d44fdf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139198727751---15033842701.pdfIn PDF document text
    • http://svx.su/ffile/file/siwatasebipadajagiluli.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851871d73d---pipifilijas.pdfIn PDF document text
    • https://best-label.com/upload/files/51880963943.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5d2ce43ebeb9e49dfd4efb0b6b3c63dc/69622457271.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/xidofevemamiketave.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sujugusimopilabofu.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/nigekub.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/61609901840.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/32011158873.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/ragefuroviwetave.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gulakuxekek.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/20883502866.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/zovaxewaxejelafenunogi.pdfIn PDF document text
    • http://come2menorca.com/images/file/51440364920.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/41465094046.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/votufuma.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/31905073811.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/fuwixinotasajavigama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jamboard+android+appPDF 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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10240 bytes
SHA-256: 1bb5bd7816b3eb67febbaf5191b57bfacec9427b270f8446fbbc96a843fc75fd
font_02_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 18692 bytes
SHA-256: fddf9131e44b40d8f5e8144a29631783d7251793061bf4f83e9f4867f46d889c