Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78a46b1e268dcad…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 15:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94d8675c2884d3c539ecc55095a51bad SHA-1: 07b5761157c2f46f8b4fb70434d965fbbbcb0649 SHA-256: c78a46b1e268dcadee7cba4d8a7e1ebe3d6bc8afebe8c14a627dd5d572aba378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress sites, suggesting a phishing or scam lure. The embedded URLs are likely used to redirect users to malicious content or further stages of an attack. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0b515a6e317299cf787c27c2559b4f32/78298372518.pdf In PDF document text
    • http://weingut-suppan.at/files/mezewonixutuwupegu.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fagonagotejimo.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/74vaccjqeukmrncb372iej6hic/70315197648.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/17252815258.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797b803e2d5---wofibawenatudogiba.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/getebukumonafatimatuko.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ahgksbgaqvaja08ovsatv3r8g0/68782274472.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/s59b4tov5q022splf7gt545kfe/dafekakegawusaxaj.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2254ddbe4---66674288717.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/n1fethst41j9dd1dri346odtlt/dikokukirir.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3c8e8632---fenopexibarukaru.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4f314800acf056d63ea27bb91ab11e07/gusitebetabosewabojopi.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/livebumuwitoxidog.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/35343017888.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s7ovus26kihkmsr1321tsiua75/wikepotusigujujuwowegi.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/afbbb670f1ca325f52e92b8cd7ef6eba/46488514057.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/vewugomofo.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7vv12sd6dtmjqqu7v5roitoqr0/pilararitevokow.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fba0fe7a---pepixikoxa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085835b7ea93---mupit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=que+es+una+nifomadaPDF 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_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 19228 bytes
SHA-256: 80a98da91560c052d30c271f517ab341097be248bf21e5d922a057d0e64149b3
font_01_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 10428 bytes
SHA-256: eab680e9429b7c9889e88704ea111a1aea39c72cec581070ce207939b489022b

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