Malicious PDF — malware analysis report

Static analysis result for SHA-256 378ef867045dc77d…

MALICIOUS

PDF

111.0 KB Created: 2021-07-17 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 85b6db2998c98acc885dc4b5ed920ef9 SHA-1: 6915c9fcdd392e07ee839d6ff65e621d47b9403d SHA-256: 378ef867045dc77d5c83ff70ed9e4e168c28adaa27eb2db3d930317863a7e5a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. This structure is characteristic of phishing or malware distribution campaigns, aiming to lure victims to malicious content. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment of a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zonwering-nederland.com/ckfinder/userfiles/files/xefineximovovu.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba7a1e249---54366612723.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ad7b57d62460800aba52ec00c28da9d1/jefokejumo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5fd42f774bf48785a3b6f0890a330e19/57841023005.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/dukarufeseres.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a143d1abe10---loxajomisolaxodasusuwud.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1f0eb9e7b8616a083031d77f9c94e326/26958895441.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c42c8860ab269aeb84f79faa4706d78/53312856399.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ckvi1ts8toul1us4ci56lmi67u/siroladukijezorake.pdfIn PDF document text
    • http://maxbrio.kr/files/files/loludup.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/85ojrl5fqrbpaf8k9mqutajgnl/rolarezilemuxuzuwajis.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e60b6672---18660399923.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca049a855dc---25551419757.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e298d05e8---wuzederigomixatige.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210619_E92798AA3ABFA70A.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/45586191772.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/53180992748.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/16632396278.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0dcaa5a5d---feputogugod.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/53bb2868faadff65dc7663c94b79dfe1/90390911830.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/xijiduneb.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e93592a91c1---nebif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tensorflow+multiple+outputsPDF 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_off00014e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E33 10508 bytes
SHA-256: a6a647bc71cae0a9746a51e64d26c430133e90fca7646b21c4a3799a0d2e8fd3
font_01_sfnt_off00016627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16627 17832 bytes
SHA-256: 414ad28aa8e656b7026b1b4895c449bb1a44279f5f66f6b8c66a7824da4d4c1d
font_02_sfnt_off0001957c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1957C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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