Malicious PDF — malware analysis report

Static analysis result for SHA-256 852c7f2b2e402233…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 16:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dc3abae6a8fac38504a8ded16eb5672 SHA-1: 896158f7aff0d5114e78ba812b03daccce11be55 SHA-256: 852c7f2b2e4022336338f5236bb5e6aa54d55b9fae67c71bf8d325351ec66743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3285c9165b---14081261584.pdf
    • http://4998horo.gmmwireless.com/contents/files/xotunupebaludiga.pdf
    • http://buergerforum-tirol.at/file/77846878074.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4c7072b947ec17a9b8e93d44264a9bd3/sagopukesowipirud.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607943eb4696a---zelujegipumerowuzuvipe.pdf
    • https://x-software.cz/data/file/gunilopedetowofo.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099adc999c0b---31654200810.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2c396c3d---11078381113.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/rokut.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4394a2eb52---sibobetiva.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/54493657963.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/66370438697.pdf
    • http://ukwoodrecycling.com/userfiles/files/suzisen.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079654d71887---44246717961.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7bb90de---zepebelobosugok.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a3fe3e23---gutale.pdf
    • https://aonetreks.com/uploads/file/93236287070.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ad4db0293028a1f110f63d9dad942adc/timijagipepiwavu.pdf
    • http://adice-area.com/pictures/files/97620846459.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a471697b655---mewusavaleli.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879eb04127e---gigazimaxuxomosaxak.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8261e65663415f03e0ceef23a7fed269/4078521388.pdf
    • http://sanmargholidays.com/ckfinder/userfiles/files/61240622813.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/3473559971.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=challenges+of+fourth+industrial+revolution+in+malaysia
    • 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_off0000f728.bin
85acc95e3a42fe34516bc861104e279219ed121c60cc9820439052d4f906c7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16700 bytes
font_01_sfnt_off00012255.bin
40446e9709fa5b0554ca61320b5006dc2a3169a880995ef147c7f40667e5e883
pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 11112 bytes
font_02_sfnt_off00013bf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF0 16792 bytes