Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9cf55e1f168892…

MALICIOUS

PDF

78.2 KB Created: 2021-07-04 04:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7e46fde1c270b77939d6b690ca5f6302 SHA-1: 6c9d823f288a9a2d236241da5e3676e370a77a27 SHA-256: 7d9cf55e1f1688921828d9f2eb8d10764eac932b5e28c7913165e7bc657b688f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/afd342554ee3470d3de52b85e8336d7f/mojekunadimepi.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhladd215399slsrigs9s4r6st/wuxetanu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9ebe0399---65751920803.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/61519694371.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8b1d45ec---jujuwefikekepajabunikikat.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b6c367fff---57775538332.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xumomadexerotazi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074089b75119---xagarusomut.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78718b65b9---32128034264.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/papefojakarubituke.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/75259698340.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ecb5002fa598fb2fbb381bc324bfaca/2085293313.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/951fc76e5c955bd63f9011690f158968/jajuziviv.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/17754104467.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3672c406---62358159725.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609569a05a0b8---mofonukujewipijutaveget.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uq8m40e9q2l2e4ou7gi3e3plgh/wetoxipole.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074115ba13c7---forurixazuxu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/voh7jdl925m87nsuc0um63c9f2/paxapofimipemifoluw.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/23237727962.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/ratoxutagidisini.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/32b1c70c7eba60a87a81f6286e69a57b/wajibawuwobupidifek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=after+full+movie+2019+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 10548 bytes
SHA-256: b42396f266b7142d1f3d2e38c4ca4deb21c0f51389f4236d5bf0085fc1f46a0b
font_02_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 15336 bytes
SHA-256: f596123052fe901d4a775462ddff44507ba1038e303e474d99c1533451cb83f0
font_03_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 17568 bytes
SHA-256: 2fbc426a259c07d89aa3b232ceed1d4534049a9c7be1cae6c362917e6e6ff8ed

Open this report in the interactive analyzer, or submit your own file for analysis.