Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd2ac6b7c3a4ec0…

MALICIOUS

PDF

93.9 KB Created: 2021-06-27 05:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b234ef974af489dcd37ed551f6bc5c64 SHA-1: 5b002c8ac67930559354842f252b6219e301e779 SHA-256: edd2ac6b7c3a4ec08659e60ce818b57b735a8b92715a32ba346a451faef1f6c5
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b97819aefdb616f17c4e9f59c5f9ee8d/73163708877.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/479d7fb6ed6c01ae31432fab86a506d5/rugiviwajuwuberegapar.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b0ef07a4---gututuwesakenitixugatifur.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160925b9239a12---kotaju.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/492f283a0f8daa0b5d01b17c4bd504d3/36814390217.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fa6q2fk58ro1p0u47vt3pd1bp6/ludixuni.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a512817d416e34f02a4390e8e1ab8023/18077498750.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bcf4ab744---ketovizoz.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429175711160.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ks9o67nvkvj690u60nqkql6fmr/80432806095.pdf
    • http://allmedicus.com/userfiles/file/wusugotawiwolo.pdf
    • http://bilmatbasim.com/userfiles/file/wubefimotiworizunure.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960aed8213a---21835904744.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c91436362---papalavagil.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12f52dc493---62562043384.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/86d901740b88730f9cb8f11cd978c71f/17981785515.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071970438db8---narofob.pdf
    • http://dharmapremipariwar.org/userfiles/file/39504162336.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6269d0cf3f000d83e646c6c39cbe21a1/gusibewiraxenefefub.pdf
    • http://beiks.info/public/file/60238568092.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994e0e76ab0---9748424317.pdf
    • http://fundacionecla.org/resources/original/file/57373685427.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e65e3d91---vixutofimibikesipagive.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/juaai5idbl2cgtj7d1lo0sjljp/pedivokodonogeruxoduji.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e720dfb8c---sonimivujigarewimupurevi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+turn+a+pdf+into+an+excel+document
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010149.bin
bffb8768a2985413bdf16481fe4553a63016ebc77ad7b07f9bd2c6922303154e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10960 bytes
font_01_sfnt_off00011abf.bin
36a2318a2161bb60d32faed72a5adfffecab6c251c9419a06f1d83087639258f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 17820 bytes
font_02_sfnt_off000149af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149AF 16792 bytes
font_03_sfnt_off000161bc.bin
0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161BC 1668 bytes

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