Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30f6fa6b1004395…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 12:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba77ea1131c53abad86b3553278ad879 SHA-1: 5d55e1d9f75854419fcae69bb6f9ae53d4329cd1 SHA-256: c30f6fa6b1004395d32f0e437e8df7bd83c6d1d9b8471ce6ceaf3c229bc4dc34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mayinmaunhat.com/upload/files/vijijozopegumosemoxexer.pdf In PDF document text
    • http://mopron.ru/upload/files/vawetekalagegitogurozewi.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/50560550607.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cce661a1e---sokamaxalixoxexu.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/55146445293.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef2064474e17e6be04f437eeedab76c3/nuzebu.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zimup.pdfIn PDF document text
    • https://kratky.eu/files/file/85225421192.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2cdc2bfa12fe1ee42da935b26edb74be/wadalatowoja.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/85121686431.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/purefovuxegaxakejuvomik.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/60455084518.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4t8obafro0uedqm7vqkpnp2d7m/kavibimuvulive.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/noxiseginu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/62088413625.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/46715857133.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/40068961721.pdfIn PDF document text
    • http://salt17.com/userfiles/files/gasufinifakojenifeme.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/konufop.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/towetizejosabaviwozi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3c19942c8a6d5ebd0d62447d4ebda7be/10200468867.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/rozogu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/45478165064.pdfIn PDF document text
    • https://rais.bg/uploads/file/gilolubeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=demon+slayer+full+movie+watch+online+for+freePDF 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_off0000bd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 17764 bytes
SHA-256: 99a23b3ca92ff99ea367dca876287a3ab769b3ca6d869e8bdcdad73cd66c3155
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 10968 bytes
SHA-256: bdd0a6f336589e5794094ad9eb9f479b045c29fbbea4405c7a4e0e34df9f9771