Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f43cb3dad831a8…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 14:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1987cf36d8f2f70386388fb031712004 SHA-1: 2e28499648c6bba00ef8429396e13d8947e7e39f SHA-256: d5f43cb3dad831a8cc6c1da7776bb647aff78999d5d8449e46978cc658feed02
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content or phishing sites. The presence of external URIs and link farm characteristics indicates a potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a2efc989981e6e5019433624d7ca9bec/86630653152.pdf In PDF document text
    • http://cloverdiamond.com/file/84250993544.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb1aa990f---motagiwowukedego.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b3c08596c---pusolozez.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/2288732141.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbaaa5cdd3---17515405275.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9d8d2fc6---43773425435.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78088387920.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8995cd72a1c8ced65b47fb6a5662951e/37618032117.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b720a2dc3---vibademadixipisibagux.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fuqhv2qg65hm2qg4qrd7h22tut/kewenoxopez.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/6721637845.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/acd2e48678355be3122a06b0c73921be/fagujufipefalivat.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2b647d638---39441403620.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/jowegaxij.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6d9130692df49f5fbff35bb54e7b8cd4/pexoralufojososuzatudilu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a622f88a2a64eacf874d2bbd4e21703d/rugatojidamuw.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c4dce074---modugipujesobabidumo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc433a4f7f---20726527978.pdfIn PDF document text
    • http://edgecs.net/documents/41475687286.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084705e48a17---pusogalaviga.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/nibepewiduwabizeramatane.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/tikiravugizuzimudewaj.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0e09bbbac48772765b52b241d500b21a/23553627155.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ffbf5nf9b3jskr0ft6jf2ehbk5/dajavenisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=computer+science+plus+two+textbookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011f67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11F67 17992 bytes
SHA-256: 33cf2f5fae4ed3b1237dfabdb014fef834db0984ed9377437e8d8c2b916bed39
font_00_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10924 bytes
SHA-256: 500391c7593bd60aa7641e4f65b32bff775cacade0adfb70e5414217fd28d22f
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA3 17492 bytes
SHA-256: bc3b3d362ac0c3b0cb89f24108d56f97cb91460480790315a2e4e5b202f61f2c

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