Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e4973e44de7045…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4090383c1731cecd6950ec68e3255e82 SHA-1: 377f15041f935ee3f232acd58595dfb21c9e1e02 SHA-256: 92e4973e44de70456dbd7925dd367fdebad83fc1480e8e9326148708f0290f9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised or disposable hosting sites, and includes a heuristic for password-protected archive lures. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to trick users into downloading a password-protected payload, likely malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b717323a2cd4774925618d76480d8340/49521516718.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d40dfb20---2467492043.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3030c426ec2a50da5b7e6955fc289826/75094066061.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b04991fe9---17438990439.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/53563642250.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/zifurewukafufimedon.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/kipepuxaxojolefal.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a4048625fc220530c03eb9b9f062e27/34392870703.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ceb86e7f8---gopowib.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/vudujunomi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405481ea3f---desobigog.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/bufogefetedeloralamomad.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0bd2c696---sisomepotoxoteduwaxa.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/41185380166.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609100fb1dea0---77203413652.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dekivopevelex.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/jenekipo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qt10nmgpoo91h1bs8k1oab87lb/gadirede.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/99365315832.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/51574053465.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/17907276927.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/nulibe.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b13e5a1d---28167708984.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3adc7030395291336bfb26ce1df7b0ea/palanobuzurodijezodefodaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=engineering+mechanics+statics+14th+edition+in+si+units+solution+manualPDF 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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 19500 bytes
SHA-256: 86e4b4fa1e93037efab951023a54a4fe71a084c1b4ede9e734a72850f5004699
font_02_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 11032 bytes
SHA-256: 1d5a718bceff815a995cbaaf192ccffa6f3530576855c57e46451b25db71322b

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