Malicious PDF — malware analysis report

Static analysis result for SHA-256 3983853bd21824d4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 20:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ced12cdf8253e23193ad01f8e1c8597a SHA-1: c3536a964260c23deb3a1ac00d96a8b4aa95575d SHA-256: 3983853bd21824d42bd0fe6c335827a73c4791100448ab0e3c8a0a0b1ace83d2
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic 'SE_MFA_LURE' suggests the document is designed to harvest credentials or abuse multi-factor authentication. The presence of numerous external URIs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://garglob.ru/uplcv?utm_term=shark+apex+duoclean+manual PDF link annotation
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/mvtsoor81htsq7cji3u5v0jm89/zopelamud.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/nezosesaxagumotidukagar.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6s4tvhqljinip8d78jm5aon9d3/ruzuje.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ed5b18f1---vefosirejuxenisen.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/83173608225.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3e72ad2d1d885d2cc8fa364029dee70e/31653171217.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/47855040770.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/wimin.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/piselerevuxevowusi.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/jetubagitug.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/94b36fc20552568f702a3c9aed9ac0f0/kaduwajupetaxulefilaguw.pdfIn PDF document text
    • http://chinalabware.es/d/files/38760196476.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bogbshct0ucgaon3rs8k341e47/babokomomisep.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a93030b6---tifixopipubatojapapin.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d0315303459---zafowepukafewuvemijiredu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/02ndg2edc83486q6dqg1dichg3/2087405119.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/makurozazobabif.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160dad7a1df2c0---jisowamolowepi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/68946005804.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/p37fu9q8m6m2ujde30bd9u7qr5/32664061376.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/taliliz.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/oea241ii5bag7l66jmm36dannh/50346162747.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/63946939623.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/fufibigoniz.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 17808 bytes
SHA-256: 68b47a3e36d0ba73ae69c3aba5b492cf822a66e9248b5ab79c59786a33d3e810
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 10788 bytes
SHA-256: 0971eff4082d662ba7cddef7ccb3e5188b657e7a543ecfb44e5548cacb374168
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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