Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c67ca810ea4b7e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-23 00:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b721b1be8e4bae3bdb5c91f87bef300f SHA-1: eb981cf116d9c6fde89a2eb2674ae534ea2ff1a2 SHA-256: c9c67ca810ea4b7e55dae3d7a4ec5ed4fef3139f8dd6c1b89a765e4248d820fa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://medvor.ru/uplcv?utm_term=ppsspp+pes+2019 PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb9765646---47463435109.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/94c31ec3e508990eebe3c435f7a14807/suwegifixezitalewowab.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/50462558344.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/gasafelakiwokelu.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/29941028859.pdfIn PDF document text
    • http://kgmda.com/upload/files/12501294346.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0dff1d0e2---85835997873.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/sajututumukivoxefutawo.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/sepizepewibun.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/33897287383.pdfIn PDF document text
    • http://nakajima-ya.com/user_data/image/file/6336477722.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/giwidi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ed2afd61---wupugajiwotavejeki.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/fumunubu.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/wujamewofo.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/zopazupomowebusopuvotedeg.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fejuzasuzibunelotu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/27559327375.pdfIn PDF document text
    • http://lovesenergy.nl/file/jaratogisur.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/49486995014.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a99d6e5d1---rovatozoda.pdfIn PDF document text
    • https://rainwater.cc/images/uploads/files/86031111816.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/fifabedafakavadonuwa.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/10245532696.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tevamorub.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/dorikumilafudo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 9988 bytes
SHA-256: 1a335437bb50c2c9c3223dd9bb65846685ee0ca3a49bbdffd7860a573103e541
font_02_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 22932 bytes
SHA-256: e6f99570ce5b7980a895f8b7a72b098948b284c11e708553f6d940fc4bb76d1c
font_03_sfnt_off00013db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB5 1908 bytes
SHA-256: e1b34b56f766b52dd7f6f1608e19e75f17ced996a683346d6fdfd66d0a8877c1