Malicious PDF — malware analysis report

Static analysis result for SHA-256 e742a24d7ff93a5d…

MALICIOUS

PDF

80.3 KB Created: 2021-08-11 08:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a65ecc044ae1e0b54bce4421abfc67e4 SHA-1: a921c03578014a1f6c34bfabf292ea4296ef7fac SHA-256: e742a24d7ff93a5d5faf72922d77b924a70be417db1b368afedc738cbea5d3c7
156 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/931432e37f29ceaa4cbf62fc3635259f/riperonibaponob.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e465df35---kazopozod.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/57169138872.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/53900483448.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/katunipusadifid.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/mebasusizugitenimevaliz.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/rugivovajisuganezekefin.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100c7d0ec141---kopezoxefajagiki.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/46b6f4f45fe8f9ff3cbd6c4d9460d53a/85032708473.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a643037b21---xivovotulafazedutituzo.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/zugon.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/wisat.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/posugepuki.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cc9319cd---58474725013.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/aoegsfek4v07rvv9g5v6co6d77/11882341767.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/pidolodokasolukarinu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edaaa5b1a84---munajovonemepiruz.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8de3b6790---kisovurevabufow.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/nevogiz.pdfIn PDF document text
    • https://techlan.pl/files/file/1780961805.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7e18ab39---xebifuvir.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/gasofemajerisirugurigo.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/rigesolek.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/jajaguwikuxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=physics+principles+with+applications+global+edition+7th+edition+by+douglas+c.+giancoliPDF 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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 17052 bytes
SHA-256: 558106525ecfe29e9a376a1426970378d8d8683a1668d669a4ab8db403b76422
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 11348 bytes
SHA-256: ac62d96ccaf15d8c8829bc7c3bdd2c7b719aea1888729d2a49c0bc0407a313aa
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1