Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e553352e04909e…

MALICIOUS

PDF

87.9 KB Created: 2021-08-09 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a7dcf964cdc36e701fc1a3e9068e231 SHA-1: c0b0da129ceb34228361dd846a0fa1f96efb9abf SHA-256: 79e553352e04909edd1009ecf7aaff26946020eeeef34db78c6080d9606ce533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and exhibits characteristics of a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+access+voice+recognition+on+windows+10 PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c2476e27fbdd3f31a143f8d76e04be23/magodezevowunobojelibal.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/faretetuvifusakaju.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/57468909958.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cadad157180fb44a14c6da8a40468485/80826461138.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/10664017038.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6f04f31e---99793582828.pdfIn PDF document text
    • https://kristinanamaste.eu/files/natozata.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/74973592124.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5521950649646ab0ecbfed2a8c268401/gorabesofaxuvin.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/4168814027.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ecd37e8---9842772481.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1e35b2c6---62552203188.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/68412777538.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/rusalupo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/64fa63a40a02ec6008e876117553ffd4/49002067615.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/73c5f5f22d35570e34409abdf501c2c1/94757469783.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca17e344b---deramipudulenowopimazesu.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zonitogazitiwos.pdfIn PDF document text
    • http://nova-auto.com/upload/19426866775.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/66228133190.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/65922058442.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a587db25a8fb5948350a52d249dc1ef0/63611299749.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210808/1517138125.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10816 bytes
SHA-256: cd5c167dc4f2d7e1fafffcc50d5d7c68e9b9de2818f7e95f7e7c1c145c29a3fb
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 17392 bytes
SHA-256: 1d1a4af48b623ddb20b8adcec168cb745a2d433208ae675eb1e688d7a68e5070
font_02_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1