Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0751e277b2339b3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-30 12:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c0e2c46ddd2399ff820ea794f71e93a3 SHA-1: 4c01f3171f4765698f820066010ccf08e7866c4b SHA-256: e0751e277b2339b37abd9dbc631e4e30d3458ccc62ec9faef8fa1fa70e69555a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=ros+cheat+android+no+root PDF link annotation
    • http://vektor-bezpeki.com/userfiles/files/99949550686.pdfIn PDF document text
    • http://erpos.sk/data/files/5467833735.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/84701130946.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/97586175989.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/93270049892.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35698441430.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/lanaru.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/40421956648.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/29557270949.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/27817785672.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/69202004789.pdfIn PDF document text
    • https://hotelcorona.ro/files/sivagadazitidiwawumexuf.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/57323170335.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/sofagamagomewisinuwiz.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/bavivar.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/mukexepesepudine.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614263b463dff---mukodesuroboxidanu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615394bdda1f4---wifil.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4btnio884ptj198u0mph12g5i8/24429811121.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e596e7d83ac73d5772bd50c2d63700c6/tekod.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/17400221423.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/kogolisedunijotelaj.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_off0000b229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB229 10468 bytes
SHA-256: 6098a2b21a9ad5884c7330e4e1ceb3658e756096057716441f957634ad579421
font_01_sfnt_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 20656 bytes
SHA-256: 742607847157a927505917a37e7ca04180f50dd45ca0c68a232082297285fd28