Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f8f47786b2e05a…

MALICIOUS

PDF

82.8 KB Created: 2021-07-01 21:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2868d434863506ce8bac40fabf19c23a SHA-1: 5ee82a210c3dcac30a520534137a20fe32376e91 SHA-256: 55f8f47786b2e05a82e823d406456bb505e9263a13c38c89d990c6a298cc6065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL targets are indicative of a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://longarmquiltacademy.com/fckeditor/userfiles/file/66719538919.pdf
    • https://powermailer.in/userfiles/file/baxanewogi.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/57634511923.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/jepegigobetiregajomewixet.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098205a40371---86898401122.pdf
    • http://retco.ge/ckfinder/userfiles/files/97283822122.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7fd893479---mafikibir.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/90377389222.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7748d480d9---593698250.pdf
    • http://jfhconsultancy.nl/userfiles/files/bekogano.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1qeuuohdiigh49970jhhsp2td1/55139482710.pdf
    • http://asiavent.com/UserFiles/file///giwatujapimebonoti.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b163f750397---29865011907.pdf
    • https://allcreaturesinc.com/files/files/63445767971.pdf
    • http://botosani.ro/img/uploads/file/97522340576.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f854c7fc31e2a2a8950bfcc71f4f7091/42401314977.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/d2jb0p9ned13oc7eu3h5ehjru7/navuzog.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8d41539059fb93d9f5efe955cc6d16fb/kugojesakojasuduwusod.pdf
    • http://www.pattyn360.com/upload/forum/files/zolazetowozugiramavad.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb3cbba13---20219802987.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pv4kjfnnsb6u7cfu3lpue5qddr/26376527409.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076836068d7d---povudewitex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=accountancy+and+financial+management+sybcom+notes
    • 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_off0000dd81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16792 bytes
font_01_sfnt_off0000f598.bin
5cf227f17544dbc7637ef64398702e16e057ff152bb881a6a3ff99c94d6d56d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 11052 bytes
font_02_sfnt_off00010f38.bin
a16a1816d479b42a4c3e5150a8a48e9cec08412e9b21244d33c2ae88cd182912
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 17212 bytes