Malicious PDF — malware analysis report

Static analysis result for SHA-256 24703086b4a7c4c5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 11:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5898fe37ec4f73c7bc23bf615cf4ff5e SHA-1: 10f59bd3c7dcbf7d588ed5417cf6b536e4c3f40c SHA-256: 24703086b4a7c4c56ca954f20213f938723aba278d4abcb6eb0de598f1b770e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware distribution. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=erkundungen+b2+pdf+vk PDF link annotation
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/dexolabegokamagi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae701258753---67204967197.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4lktj58tl1rtl2i34bkpsoe09/27808634495.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/193459783.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/supaninugixiloxekid.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/fubinirilapilisamutiv.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/3096421074.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/suzolotune.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///81788093671.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1b1db11d---72749741185.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/lumelorilep.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b80bf372270---89229259246.pdfIn PDF document text
    • http://afro-safari.com/upload/files/75617386111.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f258984ee8f---26777456891.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/49531808495.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6766868a---kotixotitis.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wudotofuna.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/dewoxijebavipuradonosog.pdfIn PDF document text
    • http://prograsifkalip.com/files/92680968389.pdfIn PDF document text
    • http://bscartridge.com/pic/96347299383.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/dosigefidal.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75dc2181ad---68284190497.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5b7u8sl7h5jad2jj0jbdtvfrb7/85241326323.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 20568 bytes
SHA-256: 78cd9d16e3ce7081d9bdd8f37b4465fe7a421ed388886419c16d4a8528a81f12
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 10488 bytes
SHA-256: a3de83a3bd708a37b45837dd88db7b6c54e7804a1f0c774f27f7472b683e244b
font_02_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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