Malicious PDF — malware analysis report

Static analysis result for SHA-256 a916c778d0f24629…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 04:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b39ae8fa62c732ce82f3b1e0096d6515 SHA-1: 55a370e8fb4f1b8112ae90b0370976c45a8df7f3 SHA-256: a916c778d0f246297eaa8e1faddc3740648b95090323d2be82e60a3b5a8e198a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or malware distribution campaign.

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 http://15889163.com/ckupload/files/jeraxazuxigufitav.pdf In PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210609_E84FEFB8EB8FD966.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f1feec877---gajira.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/22442641167.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/70176542999.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/patezop.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/28df0e550629cec04859afdadac5aaca/76084437124.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/7284794153.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/pudilisumedaji.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/l3apu7eghst8go2qu279a3phfp/jofexarodavababubisunuvi.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/samabenu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8894f358b---49401403737.pdfIn PDF document text
    • http://blueyee.com/upload/file/161849261253.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00cbd13a7---54620797887.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210619200134.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/27526829794.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zomebivolakomujaluvol.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4918dbc2c7---fuwiwatulelijelinusuvi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8rvo8gl25t79faa9lkig7bu874/81587779837.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081679fa6c5d---pobonisotogujofebu.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/47141579721.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/43438362994deeca48635745835e1af9/parudokuporawuvudub.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d981dca60---27643239638.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a5033c4ecca2ea6f3b00cb94165db0d/zusujugedonaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=holcomb+valley+pinnacles+climbing+guide+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_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 17800 bytes
SHA-256: 541a9dd4ec5ca9e88efcc832fcc4d85f4fec7c4a9fa27317b8eb351b6d8bd0e3
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 11176 bytes
SHA-256: 0404d4838a64dd51240831719af3ffc5afbe7f351ca25b12fde84f71f5b34857
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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