Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94de1fe424e6c75…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 12:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78c8f15c04feff8a471bc96969ac88a5 SHA-1: 8dfbfcc28fad74f88ff5c4face329c92341def5b SHA-256: b94de1fe424e6c752374b2db707ef9ffc285cb114f0f042f8238c53ebd10b7ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, but the structure strongly suggests it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16077843bbc566---11399755118.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3f8d7fc642518d9bd4478d96fface1f8/57116998625.pdf
    • http://kantoromega.pl/userfiles/file/24403217732.pdf
    • http://atomleasing.ru/media/File/tudeza.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b2d70e69cfce6a4428bc78517db08e55/65281353814.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cd8c4363f098c1ed00fa7fb1468658c8/dejawakukedi.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/37d8f81a52d43998e97ac54dbdf7fdf2/40596974068.pdf
    • https://classconnbio.com/img-jacson/files/bilujerinukimimolevi.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r13od41rmjmgrm72fgohg9qfhb/pugoxadusokuxojebemi.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac5881867643e91593a56294408b2273/nimarelep.pdf
    • http://runo34.ru/attachments/file/kozenolowafi.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973b3066ab---91442384154.pdf
    • https://mmszke.hu/files/file/ruxexabotenetivazora.pdf
    • http://angarakshaksecurity.com/userfiles/file/20293682680.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b353cc4a4c7---dogoziz.pdf
    • http://wenxuezj.com/images/File/28831104047.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40579ffb5---mugutafi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dnd+phb+5e+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_off0000f588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16792 bytes
font_01_sfnt_off00010d9a.bin
d29ee1cacaf1fed667526d284db12fcddf664f483bd59eeeb373ba66547f9be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 17200 bytes
font_02_sfnt_off00013a6d.bin
4b82b9f5456a23937c341bf204c43675aee648ba3cedb8b28be4578c619a0ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 10084 bytes

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