Malicious PDF — malware analysis report

Static analysis result for SHA-256 893c9ad78d8af926…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 20:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08abd4a54345e8e776cbea8392a84d0c SHA-1: c3ca050c57676695ee227e41081b0570d295e955 SHA-256: 893c9ad78d8af92683d80a348f925c1eca6dbdc28c162c0cbe9193bd0afaccff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/74cc4c4cf4fc85a6c377f4d60f5e7ec7/13518195.pdf In PDF document text
    • https://viessmannboilers.ca/fck_upload/file/26388715494.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c02a818a92c---78600172258.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b39200b6042---tasuximulotugutos.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pk3pka29gpeh6bsmpdnnac3h71/93262315121.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kefemenibavemuzagakowopo.pdfIn PDF document text
    • https://blokhol.com/upload/files/jozodekarixi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/basafugunolewevawasi.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/632f335d249c4b1c9513a711172b0aa6/60141939677.pdfIn PDF document text
    • https://primer-spb.ru/files/files/23192428291.pdfIn PDF document text
    • https://migger.dk/userimages/file/75701685054.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/57759971380.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a2feef237---19695280159.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/depikor.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cf83ad962---64507772840.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/8977734120.pdfIn PDF document text
    • http://kme-kme.cz/files/file/lefixonudamubep.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c91d6fb7c---63891245645.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/kumununi.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/6073707261.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f712158---28666690878.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d86da75f2---65515965855.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073bd576e---ziwebeweji.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/liwupiw.pdfIn PDF document text
    • http://bwc.lt/i/bawotixono.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/eqf06n7avrfth8c37k278s9mub/vasowuzugerojofevalowusu.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/vinora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+do+you+call+a+person+who+cut+treesPDF 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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10812 bytes
SHA-256: 04359e8da1ad367c4cebd7131d6dbb4a9421a0fceb61a58b469ce35dd92927ce
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16788 bytes
SHA-256: 5a5b0857ac0d28b491dc0db8f567b115427bde8f32a3cdf5d9278e184452529b

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