Malicious PDF — malware analysis report

Static analysis result for SHA-256 611bdd705603d0f8…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 19:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa264add92f84a10a93b1ea82406af04 SHA-1: 304b8a5fcb39f5dd5f38f758d9eac200356673fc SHA-256: 611bdd705603d0f81d4245d4a17eb3f1f49954e13d7c298ad117cc8dbb304090
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URIs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns suggest it's designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://alpha-cp.com/userfiles/file/pifisulogezuxipoda.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/snb3fk2kn02g258iu8cjb1o868/61125986667.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a9e2813bd10909cb75ffd47dbac44868/wipedovukogokixix.pdf
    • http://finproekt-msk.ru/userfiles/file/vedugakonazijeso.pdf
    • http://mariopresto.pl/userfiles/file/bitaxabopiwifit.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/82630799761.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/666rutfp2gqfsifgvev8f1qopv/86872573914.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gmffsp5no9umkfojp6vao7dmqa/53934900519.pdf
    • https://arab-hams.com/Ups/files/19143540065.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd94636c3---jerimitenaw.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ab6a0ac13499693e1305edcd921c7534/35624681239.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7c81e10b981c731770cb8bd735e1f262/95060604201.pdf
    • http://domeinbeverdonk.be/assets/files/file/wowasimobekuvuvajolevup.pdf
    • https://volnynaklad.cz/data/file/32940383325.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/81tti9pkjo3m41ceiconsqqu0j/zuzogenorijojagibixaso.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/189d1fa928476f47b3a8e350c860aafd/14506064575.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b889cd244d43360a1f258b3554b48d4a/situlep.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/44572798320.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/20957e34a68ba495be99c7a3df1839d8/61348086818.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085178ed3a27---xelozoxitunewidunix.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6d8537da---buzogigiwozorawizu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=peanut+butter+jelly+gif
    • 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_off0000e432.bin
efe8af2a481a96d6ae2b693fc1d06a53171c5cc7631e1b5e90c1b01ad2d98f23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10588 bytes
font_01_sfnt_off0000fc77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16792 bytes
font_02_sfnt_off00011489.bin
e8f7fb65a40193291098724e3777230c6629b63f9c3e15e87614ceae63cd70bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 17400 bytes