Malicious PDF — malware analysis report

Static analysis result for SHA-256 a889b6d6386316e1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 16:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77aadf07982da05f3ca9ee6949557996 SHA-1: c588cea16ac4d8814b552adb05161c60da05877e SHA-256: a889b6d6386316e1fb3b1fbb7285caf0c6cb68e2f90717003cffc1cfa3d9608c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c3152e418860223ed36674894f1cd79c/pofodifogoxujafasikexo.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/lerolowunukof.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ade835612e2b5e333b8a8bde9e4ee6af/luzonesi.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3005deb0a9---wirimeruruxigopisidex.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e35a83e0e---kudivogipud.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gvscm0ufk92fc9k2l2tjajipu0/vobakapuxorurada.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b64a29bd0---96973627834.pdf
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/binegarizixevazi.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/82d32a0f9759366b88e58a2c2aa643a4/wotajalimegorikematanedel.pdf
    • http://aarogyamedico.com/userfiles/file/45087462034.pdf
    • http://hoangnamjsc.com/upload/files/17981950794.pdf
    • https://lesfeesdelhetre.fr/upload/files/wapamefosifuwe.pdf
    • http://seksdagen.nl/userfiles/file/969701679.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/redakagege.pdf
    • https://iwistw.com/upload/files/31794827788.pdf
    • http://alpha-cp.com/userfiles/file/77212241412.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/wenigajuxuxakufoworiv.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add2e4a5bbe---8085713226.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6a89459f---mubovosijuxulabar.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e72e39cd5---11177978938.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bar5msi3boisj4j4ae8fvkm777/93254053598.pdf
    • http://box8websites.com/ckfinder/userfiles/files/25013265269.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/ronaramasetelujupawak.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10ebc13d9---79571819104.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=name+the+hormone+secreted+by+the+pineal+body
    • 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_off0000ecb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 16792 bytes
font_01_sfnt_off000104c6.bin
7c760e4c550be913cd02938d13443593afa1f4de2903e213ed7e617563c8f650
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 16664 bytes
font_02_sfnt_off00013019.bin
a8e9af13d42477d55e096630a9dda675ad6a2b55e24224ba4fa15cf710324f69
pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 11008 bytes