Malicious PDF — malware analysis report

Static analysis result for SHA-256 684a55d6aead2314…

MALICIOUS

PDF

108.1 KB Created: 2021-07-16 04:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2ad19fedc2c799986a3c955d4c2d6c4 SHA-1: 6d5d9f0a422a4679756645ad0b284749419547a3 SHA-256: 684a55d6aead231452f1d15f0c0da40292b60a6cef209c2b9acc2c9d6bd32da4
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://garglob.ru/uplcv?utm_term=c+words+for+toddlers PDF link annotation
    • http://marcth.pl/media/fck/file/tabegugepebaboxijatujoj.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/77092428837.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/39767835824.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4166eb44---rederuxunatikerutumivulex.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/zamugodigasavonugor.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/zadosilevoxusopif.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783cbb6d759---48427257886.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4c20482e---tuwexozozutibaxukirumev.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/75699097083.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/nagarone.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7679675da1---pedotoxuw.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/luwudodidenas.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/magojeweba.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfd2d4ae7---29601375699.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/18640543171.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d70898e45a3---xidufezelelovi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/03fc40f59f6ca0f993b07fa81d325940/75066827470.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210630_BCF4EFCF1775DB65.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/42482839499.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d32507d1---79789708137.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3909e04fba---82805958064.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ionn2npfr3n0fjtd521kbraps9/puxuzu.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_off00014607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14607 18184 bytes
SHA-256: b3243053da336d31e81bf9f7036ca4e670672aec7b21f1329ae296d51fff7852
font_01_sfnt_off000174c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C2 10108 bytes
SHA-256: b17fb170e89c5db8f9af39ccb0494ed391ceafd5aff0cafc6f2f87fb8a620a0a
font_02_sfnt_off00018b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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