Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b927eeb4a1cc4a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-10 19:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1c2c2fe472ca52242872beb0f36f8cd SHA-1: a7fcd8b25e2ed58cbd4437eb39eb6a0d9cd94e59 SHA-256: 68b927eeb4a1cc4a9582d72927c474611301809827f95708c343d5e402813a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8161a8af---bojifajofumazufesudumeved.pdf In PDF document text
    • http://erpos.sk/data/files/27298840532.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/40482086186.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b924a76a---gagaj.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dm14551hseb0rs4mf34tm9af3l/23029393788.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/raruvafajipukamudo.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/62350946578.pdfIn PDF document text
    • http://podarox.ru/public/files/10394552638.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/kivebegiralovevixebexumup.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/vopogepikusowol.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/reporeguwamasavotew.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/94115260122.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/61053181523.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134a277bfba9---723297074.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/dejifabarosa.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/refegogabolagigozifu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/jemigomogupomedugap.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/saratigel.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/nejerexasiguri.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/75578744295.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/robesatisuvaxuzagit.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/totidekelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vumoo+watch+moviesPDF 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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 17596 bytes
SHA-256: 202993891bb63bc547c4ea137b74e2a7f1741830cabe253bfa632ec11496f5f5
font_01_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 10464 bytes
SHA-256: 0bdee5dfb7334c85d4eae4ad4c18643691b9cdd243eebd99d305877a5aa62dc2
font_02_sfnt_off000138c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1