Malicious PDF — malware analysis report

Static analysis result for SHA-256 87461b3b065104ba…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 20:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a6a5a50dc8ad10bfcaaaaf1e3278963 SHA-1: a31742d1371baa3beaa50a69cf8a7370f5bedc2d SHA-256: 87461b3b065104baccb2a0121de23a46df37857b00bbf4eb92ba5ca59da97cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it leverages embedded links to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/dufetubezukebax.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p7aa7nm6nsmuubjq3mjmefjm59/52086997624.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d86b5daf3b7d24c407c09b19ed75a011/vazanuxujivazax.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210624224812730.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/mataxipovemodozazob.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f236b146b---gegolefudanej.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2d1e2fb4---sepuxukezebipapitili.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/780a00e39eaa52042573ed344e444b2e/nabarijupevibibaguto.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dcb4ba4b73d6c4a0d77846820fb37d1/senedisalelofolikoramibu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bb6eec15adddb1c677e68ccc2db6097b/81356759106.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5363e279f6ef6d9d19e3675c55ffa427/pivatepevodipalusibujinoz.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/75635845083.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/fozepozezalodibakomix.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c70de8f115c---62188516722.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/34dvhsu3r2sl4beme6ma60jmmj/fugowatemoxunugaxubir.pdfIn PDF document text
    • http://agilesolutions.in/uploads/wiwadarikiketator.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea8468b77e---38012545672.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f68b4eee0---vifabexaruluwosonokerukup.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucpabuum0takisb3jrg9c0vrpg/buvokejewajatojavodijopob.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d04f7a8587d---tirobudusixugulivavifavor.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210720_B9F6CB7C0F96ED51.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dizixipazukejixop.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/kodibizikuz.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/86041006235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hammurabi+laws+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 17676 bytes
SHA-256: c0f46e3d42f06c92b0af89392e5a6e27babe6f18045dd5481cc0dcc624c718a2
font_02_sfnt_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 10520 bytes
SHA-256: f0c62ccf153ee0c37d154bdd8414f0239d63eefbac81625351fe692378746b63