Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a2fbb98d73967a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 14:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 018e918519990bd4b5c04f924a3a9460 SHA-1: 488a0b4b04a8abe7f36d13e27f3ebcfea585453b SHA-256: 67a2fbb98d73967a22720c2914c3f8aae90bd7310c03b67817fabc2d29c4c81c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This suggests a link farm or phishing campaign designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple external links and the overall heuristic profile strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=unity3d+spider+man+ps4+for+android PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386742b1dbb---mifovog.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tebifexagevaxudovagopo.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/71534188639.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vemisudalezunefujitola.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/956f1af505e5cebc967dfc6b78e56ae7/jutukejonimuxozoferalajin.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/2647536894.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/91504002723.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/35460815677.pdfIn PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/82021311356.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/roxilewelogiwufokuwu.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/12198115631.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/nenanajijur.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/94977711357.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16139c97548f2a---69397422271.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f19417f64---15171733275.pdfIn PDF document text
    • http://shinhwacar.com/userData/board/file/15108275698.pdfIn PDF document text
    • https://buzyhub.com/files/ruvojusiduwevuleze.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99164926461.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152000f1c269---kejebevipaxutilekabode.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/jno0qbe24ail6oak2k1l297bq1/nigidiwubumal.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/44585946321.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/sonejos.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/sidazekafupom.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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 16844 bytes
SHA-256: 2214a7f72718fcaa867b2873118eafd78597f4b9772a745c00f29885e6c5cf71
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10984 bytes
SHA-256: d5a34450b71fd1548f00d7d530ef2ab45d4ede4241a057341cd10294b1ccbb14
font_02_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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