Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8f6ef439a323c7…

MALICIOUS

PDF

87.7 KB Created: 2021-07-24 06:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 393d34805822e0db03c10061457d5b9e SHA-1: 03c4678676290d8df990036bd3e089d37e274c87 SHA-256: 5c8f6ef439a323c74b7253842597cd2c9305b737eae8afa384538234465fe3c4
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a high number of links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arcomproltd.com/userfiles/file/169759263.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05268f9f5---mevijezetiture.pdf
    • http://spreewaldatelier.de/img/editor/file/gewexadobofinidobu.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/acfa37dda8777fe192db3eb34b73cc58/89708542623.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf425dd2---75952361929.pdf
    • http://praxis-greve-polley.de/web/editor/files/22510390269.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf9a0cc564---85998444167.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b76580ad3aead009508b404d4ca902cf/526718712.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a80fd8258---finekezelejubuw.pdf
    • http://abc-tel.ru/data/File/nexobadop.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9d7d4bc96063e071560219a3e1b33977/84818543571.pdf
    • https://qian-ho.com/upfiles/editor/files/19946943807.pdf
    • http://stylekd.ru/files/57581581543.pdf
    • https://muratay.nl/userfiles/file/80238958187.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/252558ae1bf73c4f3d6aeffd6578ca4c/32299233543.pdf
    • http://netinflux.net/userfiles/file/dunukijazej.pdf
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/lutufenofado.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c4041864363ae051a4d0bcde27b1a1eb/damokizidiwigibonab.pdf
    • http://dcbestwings.com/uploads/files/81381039412.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/386691cbba98115c9cbd6df9c140b3f1/zedolelevesu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d15d7c55d1606251989212d41ff7d11a/6732928802.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/solefilolarurotu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+off+background+music+in+zoom
    • 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_off0000f154.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 16792 bytes
font_01_sfnt_off0001096b.bin
7b624ba20028e74761fd52bc841fc1faeeeb30560c28721be202e63b3bc9eaf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 11112 bytes
font_02_sfnt_off00012334.bin
55dcf4804aea42cad4250db8d660abba23529e1929055ed4c21e35f437c33bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16816 bytes