Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d84f98e86890b5b…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 08:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 519faae3f9eae68bb7ea35eed5aea7e2 SHA-1: 90d821e0fe531166ee182f257ceb61e497fbd060 SHA-256: 1d84f98e86890b5bf03fd6bf343b0f288d693706492b76d2ce5fb8077ba3744a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the true destination. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739e4e93e6b---datibalijukos.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///nebumatigepamozewimefetuf.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/55094717862.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/94075062283.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/72076209962.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/siwuwumegizexim.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161113ede588b6---zunodekokekomaso.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/dewasupolovepiwawaran.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/woribilupifonaxeviwetat.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/10069113826.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45a738919---zegirejub.pdfIn PDF document text
    • https://j26clean.com/upload/files/91461392917.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868cd9f0726---sexiwirikotirilube.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/14311230172.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1m9v9nin8r9jf2ahb6qc82jsu0/27875834160.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bece4527bf---85244772979.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bd461f682---81790058489.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/90743373222.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160750100a15f1---91769285082.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/64409028944.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b3520178---gigodoje.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/vikisuduzebusenive.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/70613209737.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/23b948079e023585ebadfe27dbed0f33/dakerobujubur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=old+school+runescape+thieving+guidePDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/rovuwur.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_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 10984 bytes
SHA-256: 84fb5503fd964e4902fac5453f023cd236c82cabad1c537cf29e43ab1467190d
font_01_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 17736 bytes
SHA-256: ed3d4ba9577ed4a8eec60a0c52d5aed13372ea920f540140f16cd1b5cc19ea8c