Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee78f106f148f25…

MALICIOUS

PDF

83.1 KB Created: 2021-07-14 08:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df731679e88e6553e38ec1759febaf42 SHA-1: 5326f3ef56d22b572f05c754ceea903f06394f34 SHA-256: 8ee78f106f148f25e1f2d406c19c17f77a62836e913170829c699ccf330f36ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of external links. Many of these links point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=best+avee+player+template PDF link annotation
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a5fcfc106549229059d9265cacce56a3/fiduxaxof.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/kilam.pdfIn PDF document text
    • http://billsky.ee/files/file/64337404974.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/76d020a182fec91aef933d458b76abc5/niwizadanemajek.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160792fbeb0010---47897265524.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b1e2f4e3910dabd49c495863a7bcb284/jadodewof.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f640ad99---xovus.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/33628885500.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qvoft2mi5u4m49thojdvhefhk2/35210203196.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde7e25db4---dofamubatagosetugamaben.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d68305e4fce76eefa59b7ce5ab595133/kodonibepepagafibalarag.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609418301c539---kisarujokexotegojenoruw.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/wamitib.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0c8245d14be6e79fa2bcbd31ccaa037d/71704843237.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/savuveruviwupusobip.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/fokomowawikudarigatodin.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nosuzojetivupovivezojo.pdfIn PDF document text
    • http://debden.org/userfiles/file/nagetek.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de94316190---zetofu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075b516df720---93266874356.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26bcac78d---tumamifixetisit.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/48690751196.pdfIn PDF document text
    • https://yuss.it/file/59291296486.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 16404 bytes
SHA-256: 2310b02cf6ecb9bbb3930a4429610ac5f66cce542e91b0fea4e2bbf7b9a3f116
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16744 bytes
SHA-256: 7fece69535a768c070e7fa2aa84d840a84daa8748693d6fc2b8d2eaa760b3422
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10328 bytes
SHA-256: a9c97ac9301df993ad435c53ac83d4e2a91305ad351f992b85f72bfcd13d338b

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