Malicious PDF — malware analysis report

Static analysis result for SHA-256 960d370b67f92ee4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 23:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5e0c4dbbd1e84952569fdbd64f7f33b SHA-1: 6cb678b952ac79df80ec30af0b120b57a4cf083c SHA-256: 960d370b67f92ee44450bf3cb8b1d700371f64e3a04c41b84793cf2f43146e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users to malicious 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 https://garglob.ru/uplcv?utm_term=widerspruch+mahnbescheid+pdf PDF link annotation
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160974ad14d2dc---titofoxaxis.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/49584656028.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/15866935998.pdfIn PDF document text
    • http://weingut-suppan.at/files/pufemarevezewadewid.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/51895761224.pdfIn PDF document text
    • https://cargobull.cz/res/file/57751477570.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/repimikatobipanepebiwu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/52842654484.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ffa009ea01a0251b2807f2ddca943dda/nukomipenipu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/22458943573.pdfIn PDF document text
    • http://debten.net/UserFiles/File/kajijabotederakakuli.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/giwetoges.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/zujagezusojifo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/060e246e7c450671d4b156f3801c798b/guzego.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/6692647225.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d57020c4---19938739961.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nc7vjfjhjirod44uahflpfo1tb/61309625237.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4uhbagp90amk9pka5c7llmaren/75135924790.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe974266---65753185838.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/jovuwenevutow.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b61b7c7ecc7---lebokutifadeliwawedi.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/90845138008.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1b7d0eb3---wenosazijubamefamow.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609095c4d009c---70031572957.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 19688 bytes
SHA-256: ff801ad3656f67ecab3813eb3929749781ee470163c5450b211eb4652d1054ab
font_01_sfnt_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 10852 bytes
SHA-256: 14ba08fc3d6f027641ba2c0ca7ad88714650a570bfc2d47bb16940445390b347
font_02_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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