Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc280758257ba37…

MALICIOUS

PDF

98.4 KB Created: 2021-06-28 09:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8a9e7defeb1750f26248cc9971dd549 SHA-1: 4c839655640cdcc7f6b9d8bde365d36d7955b984 SHA-256: cdc280758257ba3734a21ca7d31c28d28021fd132f2a58df8123b7da90d4ee42
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the numerous external URIs and link farm heuristics supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://archism.ru/uplcv?utm_term=16+tablespoons+butter+in+grams
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/43eabtgku3ai9ha5djcb528cqo/naxawatix.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d81211a71b---52748652315.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4962d44332494fd0e6da61f4671802ee/48440809724.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/29181a9647f7d0c9c01876686cae3c7f/93462334301.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964b0a2a31e---98589972314.pdf
    • https://bdsvieclam.com/upload/files/71026140446.pdf
    • http://kompletucetnictvi.cz/files/file/wolezijim.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/73f37fb0a65fdeda202bd12c7be40326/17088025252.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53f8aba8b16c54a2c03538d07de535e5/53834486045.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e7508c9ec5b9f56aabd4ec8a587c1c43/9439286829.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a80199ef---bijananebefelola.pdf
    • http://zgkimsteszew.pl/img/upload/files/dulokifavelib.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210624141751.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfe87d626---jubojuz.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f8382341e7662fc094e15e7af6bdae1/fupanetigimabukeridu.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2e57090---tabog.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2fab91ac1b9ad649946fc4c279ed267b/zojazerolepo.pdf
    • http://ambvet-trefontane.eu/userfiles/files/pafavezetojetogoxepolo.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/non5qh6d604kp1br0r3l54kmco/11662697073.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5c32a397770872e814123d8f9a954ae/74936431363.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53fc13497---16860062024.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae451c88028---27317765661.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f897425199---19124279061.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/11020c60edfb2ac50ed57682d8882dfc/senapomugizepel.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ev7kgikve18339tg3qurogou45/xiduvizepudetipevipam.pdf
    • 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_off00011ee7.bin
959cc169745ef94861d1b1a05a66d7cf6bc8e3e591ddea0c5c83920acf1b0958
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 16844 bytes
font_01_sfnt_off00014b08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B08 16792 bytes
font_02_sfnt_off0001631f.bin
e5afe35103f09cc1935f0b321624edf79d504bf1abe62f7d56c66a47569bb0cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1631F 10960 bytes