Malicious PDF — malware analysis report

Static analysis result for SHA-256 d979d13b4f08eef5…

MALICIOUS

PDF

95.5 KB Created: 2021-07-26 10:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0423004878234d57dca5999c3a0d17b0 SHA-1: a5f5be39ac9636d631c8e705c3d0a55f076f96d4 SHA-256: d979d13b4f08eef5716bea915202cedda6495143ac4b15b14cbfe3901f0f110e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further supporting the idea that the document's primary function is to host malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lawyerupsmart.com/tempimg/file/38528853426.pdf In PDF document text
    • http://ejmk.com/ej/upload/files/79334059987.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/t3vtk5u87i6l05143hcitt7uj9/gomazizaguzesitipapimolon.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/98ca155f5b2d11ed903997489f44ac4b/46654050394.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbgng30vqmjud1bb99h87rslu1/45885489499.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/viderenuxezuweguvag.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/mitunobirabema.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5b8b4311ba3e7cfb92905f25772979fd/xevojawozekizonopodevoba.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/40984737850.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fukup.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160975e9d1ad8a---17862043180.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/60835874155.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7ee2c39f789738ba185f8a73119efb10/12318165044.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/degozafaxuveven.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/morimemowowulo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82ec4e6f9---lusumufidedajureretegavi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/57796295014.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe5c2a66cb---10191323428.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a707604fc3c03893cd729ab3ad06a4b2/97381075815.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd4e5bb31---sapimisumunavogiwerelax.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/91505678684.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/73396530300.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/69125433392.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/generurimena.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b81957b09---73184665884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+offline+games+for+android+under+100mb+download+apkPDF 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_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 17616 bytes
SHA-256: bdc8a31b9eed0990d99adade8928de7de895a27cc554bb78d96f1de3240575df
font_01_sfnt_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 11484 bytes
SHA-256: a5efa2918152b82230179b2663fbbf3f7fa72eee3d343daff560ab5d6743b12e
font_02_sfnt_off0001577e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1