Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b42cc587e88a180…

MALICIOUS

PDF

96.8 KB Created: 2021-09-04 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae1132f16d956b2ff9f9fc05a8558c5c SHA-1: 8a33b9d797ab6c8faad8187ff68de805902cd8b4 SHA-256: 1b42cc587e88a180b8e74236b04f24bfaff03779996a48bf5807123801df20a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing pages. No scripts were extracted, but the presence of external links suggests an attempt to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f0fb167c---75624154038.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hq387mjb8mdnvc8cfbu3gajvva/redifogesi.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/migepeluvase.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ecf02eb836b82577205588a7bf5b21b2/97987414246.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/793a65250222016005159f5f42894d15/7488435737.pdfIn PDF document text
    • https://bataretak.com/img/files/file/puwiputonenubalikowa.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b091cff96---bepokufobeb.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/97483994290.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/49877771909.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/77754190389.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/41728311544.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/6000594100.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/30329144146.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/8492614591.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3640c5d1b---50230471915.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c7b2e9775cba6d4ea4473fe4fda6a9b2/desivuzagex.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/90289615929.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/73327333178.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/182015479475.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/65a3a3313dbefca85b513be2d1c827d3/zumemopezejarimer.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bd6ed08f1---xudawemixuxipazagifowude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+summer+house+plans+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_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 10652 bytes
SHA-256: 14825cfcaeb106ca63409c68c466a13978b397232e7fc7c427a06417507c208a
font_01_sfnt_off00012ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 18256 bytes
SHA-256: bbdd6e169a49f83634c3737ca8a800d0618daaaac004abfbe07b699f2853fe30
font_02_sfnt_off00015e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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