Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263399afe2f9e7e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 16:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ace41665f11e7c5aed1593b63f14b548 SHA-1: cd2237f006fb0a30675aa404190ca9a9617f14cf SHA-256: a263399afe2f9e7ef80f3f6b5b4ee3004d2cd47941549cd4769e4654bef674d9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908b08b68c---tedujunigojovasenewur.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3ba8d0301---27576107075.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/belerevavusamezewopuda.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/lufatuxulifenunekoma.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mavizegebanolajafazavimok.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/85788541764.pdfIn PDF document text
    • https://almavilag.hu/files/files/86139979504.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/47478851282.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea7662b375---9077001049.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/41494226699.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/zufafavomepur.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/wefaves.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4324a59f0---99080328501.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/83396295423.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd76dd320e3---zakezalifupesudanem.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/laduneviwegolodazagun.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5558aedf---kesozapusuwetumekakem.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0960108daf3e04de2f07a37d3e537db0/49728782770.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/povubusotosizuda.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d878a85c---kavinetevodugutemogo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa2b92151beca5fe3521485c045ded2e/bujogafupararafugedit.pdfIn PDF document text
    • https://parfumzone.ro/files/file/kidewesavedejisaxakidom.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4af9c7e25---13411998359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=comparison+test+for+infinite+series+pdfPDF 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_off0000b743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 10644 bytes
SHA-256: 3460b7e2ab5f6d4c3ccec4c3a47ef628328adb4456623ea20d23edb4b9959a17
font_02_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 15448 bytes
SHA-256: b9ba507ab4de9ac58d4f4a8ad6a4d87377d3cacd16f3e99ad1cdde49fd1b4363

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