Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09634d1a4b3aeb8…

MALICIOUS

PDF

101.1 KB Created: 2021-09-03 17:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bfaf6829321ddb8c1cbfcedc005e1d6 SHA-1: 930608eb7cdfa58b0b6ee3f4f44be51dbb143d2a SHA-256: d09634d1a4b3aeb85dbbf7984d7644e2cb6401786990d692202e64f4b8007b5a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://extracam.es/app/webroot/arxius/file/mufepe.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161235ba76ea40---35342046635.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/19737096819.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/9233881250.pdfIn PDF document text
    • https://ienter.bg/files/pilaburi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b8c5ac43---wuzeridutoviwiboguze.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7fc5e1b1f972332e86d5071fe42230fe/wakigugurefifog.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090efc84789a---zisigo.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/25642490936.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/sudafutotuzosisebuza.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8f97d2f00ef865abb165052d5e89d383/7539366728.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/metelaziluvuzuvibu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/97032368920.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/raxilisotivuva.pdfIn PDF document text
    • https://12tiga.com/contents//files/melejitubutezepifonajime.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/pijunulixe.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/batuvavif.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/55792000648.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02370f8c4---muzedijobuxenajotasuzifum.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072554769ba2---41277326490.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/3660310565.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a675a7b40e9---pugilumufekikutirubi.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/nosunopagiroxu.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/84389007878.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kosofofetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=plant+physiology+short+notes+pdfPDF 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_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 10892 bytes
SHA-256: 91da59b68b887e8e538b522973552b1f567afa4e56c8b1a178c563cc71c75bfe
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 19544 bytes
SHA-256: e13b4b91e05f2be1ff77298e0344675bdbdb42e37f7efdfe4edafd77d6e9a770