Malicious PDF — malware analysis report

Static analysis result for SHA-256 458dbd902e09afa9…

MALICIOUS

PDF

97.0 KB Created: 2021-07-24 21:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a00818502b57481fd63a4384c0be6d28 SHA-1: 9a123868603719e4e504cf0b3fe8192470a5782a SHA-256: 458dbd902e09afa9a04317dc04e3d2a3de37da9be2ac22c33dbd0ccc19c14ea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609634762a0c4---63246650350.pdf In PDF document text
    • https://giolog.biz/images/bulk_images/files/67547560568.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rtc05l841nqblofcp200gce0i2/32705687601.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3ntgfagbsp9n7vd4ipvqdi6hg2/tarepenezisukewasajulimev.pdfIn PDF document text
    • http://funperm.ru/content/file/luguxeluzag.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ronegalodumevonutef.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/wezipaximasavibozorokixa.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/44208071802.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t01cj28pk9gsff69v64n5g82l6/75780695791.pdfIn PDF document text
    • https://mauspro.net/upload/files/66520206286.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a63c1e85---kazijojed.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8bbe9875861d9ca7732bfdf33bb3e73/41831629082.pdfIn PDF document text
    • http://vejwun.cz/images/wesekibotojemap.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed6ae820b---liniwipomuwurolutek.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i3bhos6qsprt7467o6t3at09ts/witotu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j3seql63mp165q4okp79oi65ok/fukufulitoris.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/33987350852.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/f85fe987e2efb42449f9b83320694dd7/71976595053.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8nqp8ukf54kroh4v3msd0i7dg7/dusexelibujo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0eb278446---46963613300.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/mipajevukudezufavivafusu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/24219327778.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096be677df60---88832168346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=macroeconomics+olivier+blanchard+pdf+downloadPDF 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_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 18544 bytes
SHA-256: 81001b6c156ec4a2368ec2c6bd6b6c615e5fafc7cafc889d6116045a69b2d54b
font_02_sfnt_off00015c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C47 11072 bytes
SHA-256: 520a49746df2349f5e96d17b4c17ce727d4f7c0b0d1b2aee905495c153f4840f

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