Malicious PDF — malware analysis report

Static analysis result for SHA-256 758e8944cc7b9fd7…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 02:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fe8722d03a02babc9489482afb2f9703 SHA-1: daf08af84bacb29c93cbf058a3f0fb9ee771e6b2 SHA-256: 758e8944cc7b9fd7f54463385446b6a2a463205e569cfb4900f5fa3cbd56ca87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The file's structure and the presence of embedded URLs indicate it is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=abortion+in+the+bible+niv PDF link annotation
    • http://obrienbuilders.com/userfiles/file/22683755943.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2g6gu7323cth1ift4ageq3gqa4/31782482359.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4c156c948d62f9cea1bdf5bfb040cbdc/dasuruvufolejejabodefik.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/7832301492.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/mebudevujikedudadotuxo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02e61e42494a6a97658147d9569c628a/rejuxelusadarorajoxoletox.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/dujumerawifivipupita.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160873d6f59ea0---98324939192.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e8b103854613283fbd9f32b9ac0f456b/temavisugogofudab.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/da9b3666eb6902b5fa14043964deb581/26832440858.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/30868006892.pdfIn PDF document text
    • https://best-label.com/upload/files/rusepelozijemegarenotis.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a48c8709---woparenomedexu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/al24nd90ls4khdng2ro29n8kme/waloz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fdf123f5---vebevoxixogerikerizifo.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/kofugesi.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/53593505362.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/balafizoromajaxoxife.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c254e14e208---78700700752.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/be416670e75eb02732a97a259c1f5e1a/20697742138.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rij4eaf751oihqmcnk06otv25c/94912306634.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/c44u2u8ro5g1ulk5g2t300b3hv/35237001543.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3ec7ba958b4d012b93a8fda252d23e33/ruvifurixowegidoxig.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/84730680368.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68dac64b7---45570361348.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f094a3c02e---nozudapu.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_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 16628 bytes
SHA-256: 97482d17cdcc3a9debf4f099717d26fd2d377a2fb9b3fd4a1b6acee9cf1b2067
font_02_sfnt_off00014b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B60 10060 bytes
SHA-256: 99de31ac113fcfd2548cc41d4a37b00e145ab6bb755f3d9f776a34b1e7d20cbf

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