Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4e00e5927c9b8c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-15 21:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bde8c33243cbcd70a23111a53fd3e499 SHA-1: 6feb213068cecd40dd4bbbce789d9d2d36b74646 SHA-256: 1f4e00e5927c9b8ca6d50c8a5409c84888301257a9fc61ff29da87c57a5cc592
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a4cdac73---wotimujibetupapizu.pdf In PDF document text
    • http://mosjob.ru/images/file/mopevumunipapijif.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/28370696066.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/273bd8552ecaca0e2bb2ee8f6a9748b9/muras.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nagarafibijojapi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/2487824074.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/96496220140.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6b40690ae---tazixiruwadojelovevep.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/somosukibasokapuvojidafi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58d588572---xugipavu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c915f1276---kesidisuzoxowinakob.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7a91244d---53397058099.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dca612a8b---pupopas.pdfIn PDF document text
    • https://longhoang.vn/upload/files/nesabuwuz.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/dibomuwopebosomim.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/reduliponadutefakik.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adee2a3e95---foxezedilami.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/65805072836.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/42951984531.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/42cdee103295c660c3a33cc6d1ea820a/wunavipamukolamixum.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/31190249548.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/gurufusujezinijet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+back+downPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c0c331f8e15261d59bb023fecac80f38/92249871724.pdfIn PDF document text
    • 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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16300 bytes
SHA-256: f77ae991c966f2f4997ff1c73a694a732859e103700fbbb11905a59df0a43180
font_01_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 10548 bytes
SHA-256: 1605978f8223923f6cf2213f66a921f8d2a2b0f30815b61941616ed56cd13a19
font_02_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1