Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ca6f77467846d6…

MALICIOUS

PDF

70.7 KB Created: 2021-06-25 08:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e732a9dbebf2745221c7ab3004098db SHA-1: e7b72fd766b93b360f95e74be2f23a5604816fb5 SHA-256: 80ca6f77467846d6e422d726edc2a673443445c74a49e65f96246ba008cf770a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to "digital image processing mcq questions and answers pdf", suggesting a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e2c9dbf563901a4989d2c2012275e66c/moboxuxijaw.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4f06bed581df0810270e662dadfd7fea/59018822260.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/66603161922.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/gonazijazobuju.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/844427d5bd070909b10b703ecd6f6829/nakadozumivofuxolafal.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f050a7db98---99397363680.pdfIn PDF document text
    • http://jar-ted.pl/file/27369545916.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607838cb70e12---gowikegofejadiwoz.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/766bd1d22effaa3ddcf36fcdbfba60e7/dujemo.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/kunewomijavisoba.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cd242f68693c893024111e5b50e46/koxebubolewetuderexog.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/usq9lal2ipii4itkp11qh3oq45/20659717381.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd1c481520---13895141703.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e965cedc7---21239555835.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68406c757d---81311044853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=digital+image+processing+mcq+questions+and+answers+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 5572 bytes
SHA-256: baa3776c06d47d864692527338bad007502bc1e34196900a7738f3b2abefb8d7
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 11088 bytes
SHA-256: 49f91f21fc2125d28245b3dc5330b3035c4215dfee642fa91b8ac1bf8b33fcb4
font_02_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2