Malicious PDF — malware analysis report

Static analysis result for SHA-256 6393c71ca2be9c90…

MALICIOUS

PDF

76.9 KB Created: 2021-08-30 13:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 390bb7084f926079eb41acdb108212f9 SHA-1: edb38e53feea3e882c032f4a692e784d1ce38145 SHA-256: 6393c71ca2be9c902243cfb157d18b9a6e5cee628947c5cdfaf8e7e16fea35ca
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=mars+in+cancer+7th+house PDF link annotation
    • https://rtvpuls.com/ckfinder/userfiles/files/170518309.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892119dfc38---80989677630.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/lezoxujifuga.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/rudofuvigakovulamozogig.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab9a95318---pumomedawubokutufixono.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/fenunulefemet.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/liguresoxubakeguzesazole.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8affo4drt6magfsf23r0hj8f9c/gasiduz.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fea273992c3---tukaf.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d687a063ab7fed226d49ad22401a7246/98614713576.pdfIn PDF document text
    • http://termocity.by/pics/files/larezejonuza.pdfIn PDF document text
    • https://zhansq.cn/upload/file/lekitutawoza.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/59103556193.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/091615227745.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/posuwogilapawow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71cc600ce---mifojepi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/30841307432.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/73821309579.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/trvsorb60ulups3b9eavt4nju6/gaborotozekud.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/31206692397.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/11983024166.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/zimimaworum.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/51910015633.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f53aff34a3---nelasodetabebuvojare.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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 10424 bytes
SHA-256: e821553142f89009fa86e4a683335d8dea6eb9779d599ebb83a28490351a6dbc
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 16636 bytes
SHA-256: 6db239120be212ed3f9ecf9711260abf249d1ed8d4f4a4020bb10184abea2f6c
font_02_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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