Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35a92b5bd2f69e3…

MALICIOUS

PDF

83.7 KB Created: 2021-06-28 19:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ced9f11ba542ff0ba6c1fd0c0befccdf SHA-1: ce802acf3511f2d4d567e9c9a410fdee0a405512 SHA-256: b35a92b5bd2f69e309854d2908f12dce0eaf253fccce744be809e3e3ebd3fd2f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. The document body was unreadable, but the presence of numerous external links suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1dfd2c97cc7f3b6b6c75c7a5367bf7ea/37849804717.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd85c80e0---nexatuwavaj.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4b4a1626f---patimipepajaminezegupixev.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/47839660012.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/82606441152.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeb82ca24---mivaja.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073190999567---fawirasisaj.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c982605656c---983235273.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/61465621206.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lerufojamakadunaputut.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///mamezoniwuwam.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/tazefewosoxe.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/gusufafikegigemarok.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ge4p2dvsbk95nqbknnjqpn0e56/57229900722.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/16831858421.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e68122b---dazosinevapopuva.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530869f525---36629077799.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81156eee4---19710831811.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/976e6dd03a9545d9d0bb60957e9dbbc2/vufewepaxanofunebelezila.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/98826152515.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9f86c8a032328d8dbfe614ddef5763ff/vagixiridadobevemug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=positive+effects+of+population+growth+on+economic+developmentPDF 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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 11320 bytes
SHA-256: 25e07eda41d5b12f4a8cbbf80e10d82093519234b61d35e9bdd440683d6735ed
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16680 bytes
SHA-256: 209b0aeb12a821899d7c325b4c1cc540a4b4bc1211ed81ddb26be556ae0e8a03
font_02_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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