Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b39683bd2004e…

MALICIOUS

PDF

91.5 KB Created: 2021-07-19 00:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6909a352073157db9151b7211c603237 SHA-1: 6f5fa02635080969c732a55fa35ea7e32a3980c0 SHA-256: 951b39683bd2004e737b38b30a1dbf74084b8ac9cc2387cf39d820f5fe42684c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9d1d9f848acbd3fc1aabf5380d346403/xadunedid.pdf In PDF document text
    • http://evevoyance.fr/adh/.-/file/6229331484.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/098f412d80b1fbcee594042845881063/kibidedad.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/72570444863.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080599f33c16---70806051035.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/mifujepatubapawapivud.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811da500d12---10935588992.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/barus.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb4003ad8---pusitariged.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/tp7ifqm3vj3nf121457of69u94/37601068749.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9533a3168a8e9b3c907ab7685d048ab7/subogomazesolopefa.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/118f1d954e6ae78d3b4f4df404fee5b8/tofeduwutomof.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04c233879---29611805124.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/wudilaxagizavuzemasuv.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/nusafukisol.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1sc68e5ejgbttfar615fvvcksq/lojozipataniw.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zadalipasajugajodedo.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/bizofive.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/zarogunolexozuni.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160897d6d685b5---23021209683.pdfPDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac911951b15---lejotoxitoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=grams+of+fructose+in+a+bananaPDF 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_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 17440 bytes
SHA-256: 1ebed49318eac0baf4050774a93c116ecf702d49bd1a4734f8af5aac381f052d
font_01_sfnt_off00013039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14850 10732 bytes
SHA-256: 4068d1728c24c2d9e0c539af9622ff9c6a03b9512967bd1d85705a745b0c1809