Malicious PDF — malware analysis report

Static analysis result for SHA-256 e336c16902a54366…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 08:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a376239dd5246438ab07c392a25fdb13 SHA-1: edd335ed4973bd07aa61e03475cbd5714698befb SHA-256: e336c16902a54366a2890b55e24c287c7611a5b6eb46eae95a642086c0676bc4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 http://dejede.com/userfiles/file/poxumor.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea4d507ba---20955119138.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/63663340212.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/niveruxubinatuxusobo.pdfIn PDF document text
    • https://izometal.net/mm/file/livizeful.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/tatizukatilujusewi.pdfIn PDF document text
    • https://tele-video.ru/upload/files/damatanosil.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/87987260147.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/34130908611.pdfIn PDF document text
    • https://cowik.pl/upload/dawolupisesutevadeda.pdfIn PDF document text
    • https://hobbypet.cz/files/file/28714195061.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/kamazivurapajat.pdfIn PDF document text
    • http://househouse.it/userfiles/files/ribobukederevitapidunater.pdfIn PDF document text
    • http://dnepropress.net/files/file/nonab.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613873bf0f6ff---repuzapuvadugovorolijidur.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109021004296632.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/18156315343.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/81076722425.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/zositiwevomitisobeli.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/49441088766.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65291d326b1f8967e58965d23e2c39b2/dumirulipuwegirurezil.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47364edcf---vixabulujiwalunijoj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a88d95ae9---konedadaxomibotajuzato.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bazometedixuwanebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2020+my+country+hack+version+downloadPDF 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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 18032 bytes
SHA-256: fd10fd656e017e52c0c004f1d65fdc975d2c6820cbb608d3b956ccefa05dd758
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 11240 bytes
SHA-256: 8cb14648723c2039fb865ee618bccb2eacbe98c6a845aa2d0a61e64c6627bc4c