Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51d035c9edca263…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 10:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef1b06085aab77b32072581475931ebc SHA-1: f9aea5ce99678bcd6a8067aab43669f04a9252e2 SHA-256: a51d035c9edca263cf4879465772b437a81bca33b7684daf4f824ccae4c2cf2a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its role as a lure to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=battletoads+in+ragnarok%27s+world
    • http://4998horo.gmmwireless.com/contents/files/dovegilukarabinupi.pdf
    • http://ventexevent.se/uploads/file/4200183539.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3d90d195---48732626236.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb72990d1---feboxevinut.pdf
    • http://rayhovietnam.vn/upload/files/50175187139.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614a30c883551---riditefufafaveboduwuga.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xuvetaxepinatavigimese.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/614e568f9bd78924e22fb0b36266fe77/moxojon.pdf
    • https://sjaindonesia.com/sitefiles/file/pakuw.pdf
    • http://musikpark-live.de/userfiles/file/36857262316.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/3759113733.pdf
    • http://www.smpnuenen.nl/images/files/7554306809.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/pugixafo.pdf
    • http://samnakthodrahassob.com/userfiles/file/kejowuvalewira.pdf
    • https://seltec.io/images/uploads/files/38665218166.pdf
    • http://mnarch.it/userfiles/files/velatewipamusaxe.pdf
    • http://tradotel-riviera.com/file/61048219737.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161495fff5be68---laliguwinep.pdf
    • http://union.travel/ckfinder/userfiles/files/85031345680.pdf
    • http://cheliabinsk.realxenon.ru/uploads/files/koterajov.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i46h9mdn5bttnunv7i694ct63b/misazixixizalug.pdf
    • http://csc-020.com/userfiles/file/20210920022117_byaxhh.pdf
    • http://mylodge-naoshima.com/images/blog/file/fuximunifipit.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/94646120744.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiwiguxowetoxuboxabu.pdf
    • 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_off0000c174.bin
558588d91edc90f706f955a0008dab2ae6f39b05539ef66c0482e8b3c1d9b63b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC174 17508 bytes
font_01_sfnt_off0000eee6.bin
603bb043eba37b86cf058850acafc90310aad7a6cb9df61ab0f5ffb2bd584803
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10688 bytes
font_02_sfnt_off00010774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes