Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab0cfe5818d66b5…

MALICIOUS

PDF

96.5 KB Created: 2021-09-08 07:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3e82145c93ade854c2f9a02829894a7 SHA-1: 0bd6a236309847f26391f4a8444f100cc6c5e2af SHA-256: 6ab0cfe5818d66b5d179ea4ed7051d81ca6cbfcac40225adbf36c5d07de20706
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. The document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ci8bhqo1o2cs6aabvchiv4kiq6/gezetunulevotepewifalixob.pdf In PDF document text
    • https://ideylia.fr/uploads/file/bogukezinokutomesagex.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/df7c951dd12033adf3b1997b237ec1e7/63742213141.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hdlhbme5sk4dnchjl6outd6uo7/43993919484.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7750f81b---magonijutexekawomomipanuz.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/32666014784.pdfIn PDF document text
    • http://cjatkinson.com/userimages/xifoganibekizal.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e5b30e5d---mamusodegoja.pdfIn PDF document text
    • http://markone-tools.com/upload/files/wulitidit.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/31139715464.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/vesamexata.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/kamiloxosasiwelis.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea102806f---77162831005.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/kiwopopeg.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xerixuwele.pdfIn PDF document text
    • https://rcot.org/userfiles/file/ladow.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7bccfe99---63277411391.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/susadolixevixok.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9112e0cc788036d726169fefb7bf01f8/16338924964.pdfIn PDF document text
    • https://tekmaker.com/upload/files/98373577956.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4569925b5---dupajeropifuvaxabi.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/1b598113adfd3ae9b9c26c13cb003fca/kodafogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rav4+hybrid+2019+manual+ukPDF 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_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 18488 bytes
SHA-256: f34d6e941ae613c4d864c2ec7baf6497c762111a3b00ec5a50518ce651aebc30
font_02_sfnt_off00015af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF1 11092 bytes
SHA-256: 37896b458c61dcd224d28d4f1b54c260f24bb98bba166275fbe62b2e1efab6e3

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