Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a892eac8d2af88…

MALICIOUS

PDF

77.6 KB Created: 2021-07-17 02:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2f3e8b97087b6f36aa4bbe69eb15ca8 SHA-1: 6567e33641035c81ab1d9948d4cb356d4e8d1910 SHA-256: c1a892eac8d2af88652c4f98712eb90db13b19135e69703cffadb00cabc0031b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of a link farm suggests an attempt to obscure the ultimate destination and potentially distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ced44ef---6946636744.pdf
    • https://aspirans.com/files/file/bobijukameboniwalodelolo.pdf
    • http://plastikacz.cz/soubory/files/84599339360.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ae0ee7e0---50362476618.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/158ba8c086e5459bd67978b98e1f2516/kapuwusutufavidulapevog.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/49c6f0e12b7269eb1ed2ba3cb391926f/95421148855.pdf
    • https://tsafar.ir/basefile/tsafarir/files/gobewiko.pdf
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/57141842990.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca94e7274---wofuzufimawifadu.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49229590933.pdf
    • http://marthomaiticherukole.com/userfiles/file/gagefawuxenizogodebawup.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9e708a06---6567377561.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/korg46clketic5fesmbo3khufo/43804304750.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796387525f8---zafulopil.pdf
    • http://richmediahouse.com/admin/uploads/file/gubawefu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a9d32f3713fd02c3a06ea649a22ee049/23198736617.pdf
    • http://russkiivopros.com/images/FCKeditor/file/mavomubap.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9447f35d---27121674811.pdf
    • https://mariellatriolo.it/public/file/duzelenedafuregojeta.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a6a3c8f8a1a4c5091008f6eb2d963fc4/59190216088.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cea8d8dfafc---26534157490.pdf
    • http://evevoyance.fr/adh/.-/file/18565102788.pdf
    • http://royalwedding.jp/images/blog//file/85758319375.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f034bb368---59133456145.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=1+bhk+house+plans+500+sq+ft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce77.bin
6bff071e106c2f4fcb2d6fdaab2fc55da2d5836585dd93cff130bd2fcda6076c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 10952 bytes
font_01_sfnt_off0000e7b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16792 bytes
font_02_sfnt_off0000ffc8.bin
f369ee533a04e323d750e09affdc3a3098bbeebbd59525628353007018b76bfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 16228 bytes