Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9961043acd6822…

MALICIOUS

PDF

86.8 KB Created: 2021-07-24 03:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c38495080cdbb8d1e3e2a8eff56d5410 SHA-1: 0044a73b8e9d4b17c5f3264188b3a88c8e8affc9 SHA-256: 4a9961043acd6822e99a74c99cc4e5599f14f8823260886e404eebe45da51a08
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. These links likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/1fe231a0aba91137fd72078f125f33cb/63623806494.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be68be132f.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/93258916125.pdfIn PDF document text
    • https://la-klamm.org/Files/files/sozometukifajoxoxavu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/41085bc30fac31c51c405bbda0893eab/59357601391.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pifevenujunuramaladulo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872f39a7fd7---bafugewixolorakewewefug.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/52559792551.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf421948be---tobanawus.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/debemi.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/17960351998.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbad05f76---68374278549.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1cf1f3d5---5096730233.pdfIn PDF document text
    • https://grouptm2.com/contents//files/dorosadokexugaki.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/499f076ddd877da8e9d8822fab542449/84634905060.pdfIn PDF document text
    • https://bataretak.com/img/files/file/61309178759.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/sigetoxenijabenatepezalu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/50794425448.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/kuuriqul6f11hle08nqrlnpdpn/migumonobuminowujikigesef.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bde897e1---56875491748.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/bugasakosinesedo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05dc50ca9---5499678800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+measure+bike+frame+size+mtbPDF 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_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10692 bytes
SHA-256: 4af8164d8688cbd922bd35d189c3b6693003ec8de9a0e3466a6bc608500aa40b
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 16556 bytes
SHA-256: 2dff70b1d2f1b7fd82355400ef75c131e57ce1d6e672d0d1d88e117ec2147e7d

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