Malicious PDF — malware analysis report

Static analysis result for SHA-256 be692c7ac5739d4b…

MALICIOUS

PDF

75.2 KB Created: 2021-07-01 20:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 350052b131ed2e5705cfc2755710111f SHA-1: 4049f4be44b840c2c95ce0b00bb3bed1bb78418f SHA-256: be692c7ac5739d4bc59e77d7dcd37f0a7d606a5dbbc34880864957be26223a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious content.

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://huntic.ru/uplcv?utm_term=how+to+get+a+pdf+file+to+print
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/veemdiccd3ml6cijrobvffcjj5/mipegeniwutaronakapoxatab.pdf
    • https://vresponse.net/userfiles/file/96506253184.pdf
    • http://aceonlinementors.com/userfiles/file/81454572252.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/djq2pqe1c8hqfs62g518skthku/5909834570.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160948b8d34551---90868729362.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/871b4fe7e31e6165a33f46ec63611bb2/tujixunebape.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6eb46c9c---79720651863.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ca94f1b7---48878226964.pdf
    • https://wrd13.com/force/file/namujufexirivukuv.pdf
    • http://irinaburmistrova.ru/files/rovizozaliv.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d1b4e813---nigin.pdf
    • http://bluecars.pl/userfiles/file/tutasubedufidiset.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608038965008f---xumumakovaguzelejedexi.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9et59r3d04t7j0dojmep9g3nf9/banafipelonidanekikitewo.pdf
    • https://foodvellythailand.com/upload/files/xidobo.pdf
    • http://szentistvanpatika.hu/upload/file/91404836469.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/kbm5t0lhf9hfk4pknb7kgbc3f3/juvulizamag.pdf
    • https://arendic.cl/files/jafozajexowowimomu.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gejhh203v3gcbo5is77cqhh2ki/85863515848.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dlncpoj5m7fa98he1hn2noits7/nigabitobu.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/telaminugiwowarerudazepi.pdf
    • http://metafelix.it/userfiles/files/xokijuwutazezazawezili.pdf
    • http://cz-synergy.cz/data/file/xiludefa.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2227d8fb90---56356449552.pdf
    • http://costruzionibulagna.it/userfiles/files/15475203587.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_off0000c741.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 16792 bytes
font_01_sfnt_off0000df53.bin
b3ad61394ca708ef3a3c16dc8ddd31587b604e7e62262fe83b5cd77c6145dd21
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 15788 bytes
font_02_sfnt_off0001080f.bin
d71393dae8fbbe6531455ca07d0bd2ca4294688357005bc77a5e4f69f103dfde
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10584 bytes