Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfbd3d10d30447d…

MALICIOUS

PDF

87.2 KB Created: 2021-07-06 18:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 741942f9312e9d30e0aea206dc6fffe1 SHA-1: 5229f3661331ca34a071e0bb6261d5df0225a2f6 SHA-256: bdfbd3d10d30447dce1d8c12eb5dac3d1b24963cf13e79a556aa1a93fb43471e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the presence of external links suggests a downloader or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=activity+2.2+3+recycling+answers PDF link annotation
    • http://htwy.com/upload/file/lasiv.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7m80eaasf9a9o0ufn0rhejlps/zelatemesefar.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/newuwazudojorox.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/regamikuvogesajiwebu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3j4jm12uonlpng98u6213htao3/surepolowagaselasumiwedow.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebefb7ab4---18016367703.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/11066970999.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/97462838563.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a11c1a26f7e1a6ec626402abf2313fe1/tupufuv.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/xajudopetodego.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/40228908937.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/k5hui5cuqv2ob9sbejjcloongf/rasorujuduzo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/llk4ga3jfcss6mqcbhb4o4n8rq/45212257828.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097102bc4c8d---9244315395.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/noxujafasukelim.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jb1jtrbs8o2i65hbqeu8a35rei/59462060458.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c935bbdaf49---rasemuferewunobomol.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9a091a208c25f94b150db9ae7a6a4692/sowewe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf51b5c83---78508773259.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/336a6d06bc725d0ff1f59132d4e20727/xavokewafawa.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16094b84b13da3---77549055294.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/81570975268.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/vajitomoxitikizugukajub.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zelaxudogezaxitiminozogu.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_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10888 bytes
SHA-256: f58df2f15a807ce29d03736e6f9a39edf1c4b428a6bff0ebd257f6332b6e77bb
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 17144 bytes
SHA-256: 97bd085b7934765c9b561af53a00a04cf778da44739f37a7ed4710c911cb75bf

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