Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1bc336fc2f77c4…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 06:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ee103b466075abb5c5f4c8703963959 SHA-1: 68f01e748c61be59fd5d1e6d3b632280c10b34b8 SHA-256: 4c1bc336fc2f77c4aac8fb4dd595a2bf259476f773deadef73009266c598a0a1
196 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 phishing or trojan threat. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The presence of a 'LOLBin run command' heuristic further suggests potential execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699708caff---dijoma.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/sakiza.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b082b656d---jewekupevanowojitikamaxa.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c8032350---zulujiwavupupimetag.pdf
    • http://alibabashipping.com/userfiles/file/38916247808.pdf
    • http://tiszaikaland.hu/upload/file/sojovi.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/n78p6gtm5okma34spusodqb7j1/51501985749.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033c73647c---tizaju.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/3a80f01b43f46a40529cad8d4dfa35c2/vitoxorumurogelifubenim.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cac73c87b568ca2cc1dfc90af8d3f144/dowixamepedubekukeruxoka.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170eec8717---44008286247.pdf
    • http://studiodabo.eu/userfiles/files/jizavodemoduw.pdf
    • http://ahkjt.com/upfile/file/59922631419.pdf
    • http://grupophi.es/uploads/files/21565323208.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vm2d1gpdeaias6mdrpf64bh56u/tapumifetep.pdf
    • https://texigo.tw/upfile/files/2021/06/25/52512483595.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609059f110acd---vepofuzo.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ort7kga191avm9vkcm0uco0d38/tafofomafiza.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61862e37e---ribodidap.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/bitikegiwikilapozinove.pdf
    • http://aeronautike.com/userfiles/file/55633885000.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2fc12dfcde2408bfa032a9722bedf4b3/38236731344.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd352581eb---98648879766.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af901809767---donenetul.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/14894465988.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+add+a+friend+in+minecraft+java+edition
    • 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_off0000eecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 16792 bytes
font_01_sfnt_off000106de.bin
b068218d828dfccebb17c0f8d450f02d9e0a097d5dec3cc37031b68ad50c4979
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16996 bytes
font_02_sfnt_off00013320.bin
eda2f8c9a664079a5847b23d9da1b4e16057a4832ca055944b31a1762aaef906
pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 10696 bytes