Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf605f0086e91f67…

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 02:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1278b17bdc0acccf1e6bd70763a581f SHA-1: 99749f9b07f9e43893e3f73c04627ae8f75ab4db SHA-256: bf605f0086e91f674fe976b6026d22764815eed036b80bd4a13f37bfac8a7357
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dvsb0oc6tu7st0d8r1cr0hr7u6/883131485.pdf In PDF document text
    • http://plantessentialoil.com/upload/files/9743670648.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835afa8fd3---48373955942.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/90494897481.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210511142445.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/63ae10c605484d1395c4b661483876a4/54160234444.pdfIn PDF document text
    • http://skupka23.ru/upload/m/52650547831.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/96605389012.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a92e25d902450572cc2a73400def0fe2/fetipod.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b564189018---9186214347.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/50902430327.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/8035987145.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04cd5375ea---79214896007.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/mikasus.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5aa0e973---javutupepofejewelametira.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/pp1lq12hjd6958k3avup36qe3n/tanetuwupize.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf8cd6d2---geposekulowomovoxufor.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/ruvazinegafed.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/90941661903.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/guduxiwabulikopitetajerus.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072dfb70b4e5---jepujozezenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=red+and+black+insectPDF 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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 10420 bytes
SHA-256: c46b262791ba96f78322c22e76615e6c86acfcc57a4bf56278a89b1f6db51ddf
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17096 bytes
SHA-256: a65e691b491ea229e6ad54952ab88eeee99a431e8d0140d0bcb9e10f14288518
font_02_sfnt_off0001272a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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