Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b5038ae8e8a0fd…

MALICIOUS

PDF

184.5 KB Created: 2021-07-26 14:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9c58ee002db6ae9d7feca8d71d42487 SHA-1: f66ea6b0e7c1d591444a7067c2e5b1ab5b7d49b8 SHA-256: 30b5038ae8e8a0fd93ccb5d1805242dcec1f78f99e32091db43369599db22bc4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm used for malicious redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of these link farms suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9730

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://theheavent.com/userfiles/files/15861090337.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/15851311697.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/38886539795.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dd743891a048ebaba07830418c452d0a/20328582100.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/dufurasutisugekeremudoj.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56de2c2c8---nobetakabizesobewagukinu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609855927f30d---99432156336.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bumoniguxujapofix.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba86933dce---35539246360.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cfafb05331a8515a1fd17b9eb3bdf74a/72240101269.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jevapugesixobepikuz.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/wikegofulunal.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/50056087948.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dafca2476b60d14897266e9d543c6b90/ruretomukugit.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b879bb4f050---xituboji.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c6798003ad078832cacd4e465f7c8823/nozipuvilulivuf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609995acd310f---wuvapiju.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3903d6f947---lenipizudobugulozukat.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb9875a74---jadulozinefaw.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/32782207228.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df784b48c79---10013803991.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n5cjqnkd9k6ct8nm2gok5siq8v/43719617446.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8c11155c---34698038461.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pexepinixodibirefexexori.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/17175836664.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106290851144780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+copernican+revolution+thomas+kuhn+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://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_off000273ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273AE 11104 bytes
SHA-256: 23cfa78ad75b1690babb4dedb0086d1f934a9271d9019f25538805039ad57905
font_01_sfnt_off00028d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D66 17252 bytes
SHA-256: ed2596247f570d5baa77f220c06c1f180174d0d123d051db6f5ef3f243f5f8d3
font_02_sfnt_off0002ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1