Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cabd63ec72a9190…

MALICIOUS

PDF

75.4 KB Created: 2021-07-19 00:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 37de039c39d65311262b1e46edd9f7a1 SHA-1: 9661120e91c4ec2099b3a67574bde76cd9429558 SHA-256: 4cabd63ec72a919059510c0d81b4b2716af62888c0b3444eeb22c005106c7de8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2e99eb8144e82d1dc006d83df67d201e/59023719049.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/31146442556.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/funezukesok.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fozanijebokulojigajuda.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607658a51f21d---zekarizotabogegunalipimu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/68095428942.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cbeb7f82bb560d1dd666e3c3a4b662ea/28883888835.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/monovuvavowosiri.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/popizibifagufuma.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/62869609073.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64bfbbc400---gatenifojo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/029a737f39e6f51d1f3a0a46ba10006e/pesenivavogulexiw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3f9nf5h9bscogkmmtmfjl6834/51952848704.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041ac75ee5---87182904631.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vikoxusu.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/zemixuxixamudanid.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f28bb713eb11ee68496339f7a6ad9ed2/26622614961.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68db245b8c---jedolasawaxajije.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/90665048535.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/17020769080.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/momaxuwibobusogalaxus.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/dapide.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16092461092187---62971669734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+textbook+on+power+system+engineeringPDF 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

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_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 10904 bytes
SHA-256: 9d90ca12ad00a262fc9d4aa8349dc8f106ce5a6c65f5a438e06c70aadb784247
font_02_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 17000 bytes
SHA-256: d756fca043da7d94f1475d49a10e03dd1229d8d1bced614eca95bb3d0f20b0d8

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