Malicious PDF — malware analysis report

Static analysis result for SHA-256 e635be5d5ea9f22f…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 09:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6620d974d93fc40d5abde0866b9b674 SHA-1: 587d05b2d3e31207437f85f992ef96de251adc4e SHA-256: e635be5d5ea9f22f60728c437994ac8a2e441f88580e2fe247c843864475c462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3dce4e19e0b8ae905dd8f12156dcd8a6/82427193662.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/65be3b18215c5d16a5b68010425ec1ac/povagixirizawomebidad.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/matukena.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kb44qj880hbo6l5gbaa0e0h5o7/25470388326.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3c2cf8b6---jupoxemez.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/liv2c34ib0nkatj675b4hbm0lr/vibobevojaridofakawijili.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/palasajenamoto.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dilobe.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d34002c98---9985011153.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f9ee9460---2338830734.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c6eab93be3875e81550fcb3a9d30bcd8/safipanilenukitis.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/46ff660f6a288e0b5e32755c2054a144/sodopobamexeradaxosi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ed4d4337---59731780090.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/vofoberu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8032d29c7772a512005221ba86e5a5b1/19237358860.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/id0ro15407d31oggbkj5eu1qr2/97884794756.pdfIn PDF document text
    • https://cristalensi.com/public/File/14923144517.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ec53d41---13247912125.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085527662f1b---23807399494.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edacb920fc---38745542846.pdfIn PDF document text
    • https://samtee.com/admin/images/file/xonedaxixelukikumapopenim.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/nnm55rl46duvda888sh7refqbh/rixanovorakesanuziko.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/juvazigesujiveweguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=old+fashioned+courtshipPDF 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_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 17084 bytes
SHA-256: fb767a4b285f45e9b7fced24dab7ce79f0048f1f8585400741e34306deb3e978
font_02_sfnt_off00014116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14116 10844 bytes
SHA-256: d0578904b6eff97662f73f565ddd7fa77bdc07ef3d642f291478792dc41742bb

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