Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec422942bcd83a7c…

MALICIOUS

PDF

93.4 KB Created: 2021-09-23 21:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ca333b7660c37fac73e27b747b53b21 SHA-1: f6ef5678277d495612f63f14a9584f2e3ffc80b3 SHA-256: ec422942bcd83a7ce6dd160cbdb48a97895745064404a43557aa32375f179596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://allytemp.ru/uplcv?utm_term=cities+skylines+lavender+lake PDF link annotation
    • https://network-italia.com/file/53434097069.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/89390814920.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xobibenelawidulubudater.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sbo40beqg3nor07eskholi9lk6/89568249168.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/491086346.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/98f0a525edf377b9359829a0fdae683e/59637749999.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/30780239227.pdfIn PDF document text
    • https://kiptep.ru/file/nusepoxikafagu.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/97758177633.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vegibegepuguvej.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/duzotamegitunudidinadusu.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/wesegupulixo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1933509316133d57575d20.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/16372249516130af267ab2b.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9fr3q22ldefaqm1no5fkk0lusq/31733872509.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xibimewobenawi.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/jegidasifo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b2144b1f4c655c0d5c3600cd84f5dfbd/10508871884.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rivabapa.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210920234850.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/gawujewagaji.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/27370514180.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/89332232916.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/76522851550.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/13704593760.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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 10424 bytes
SHA-256: c51775f3511b1016cc230da107a90aeb6f4c2608e66aa3927ea0669e2a3abab0
font_02_sfnt_off00013602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13602 19372 bytes
SHA-256: 80016a26a50ffc876bcf40a60d362157b851957ef9daba36da77c5a9ae394aaf

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