Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbca70335fcbc89…

MALICIOUS

PDF

103.4 KB Created: 2021-06-30 10:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77c9103e6080f27fe4935e5731561dec SHA-1: c017c322ba973c15120e91fbfdf3b99ca116b5e1 SHA-256: ddbca70335fcbc89161e8995088b838311c32755c6ea655d602a8b317d3ccbee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous extracted URLs confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c46a8436b---gapekapi.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zijoxuzexumamavo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kumawid.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/wufobewoxabuwisuvudago.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dd174e42d12b39ad3aca8ad03c9312ae/73046083157.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/14987494321.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/32734450353.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/43158024512.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/96099534417.pdfIn PDF document text
    • http://atomleasing.ru/media/File/kuguzepotimezasuzixa.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kakisusirenafagemewo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f2e7ae9a---komidedo.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/73571513538.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/15815499492.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/crf3d1td9r77mabet2bldeo800/dedimesatilexa.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/komarosoxasup.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/b01eu3e0bhqjbk3i7q76q47cos/36336854187.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9efb70e23f192024f15cb12c1cc0680d/nuxipemekatiwe.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/89457798648.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de20fbfcc8f0a6d216bdebaa385f89ce/zejanebululetaranaxalijoj.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d50c5fsicln55lrb6ppjtbia5h/makozazufemelegexaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=juran%27s+quality+trilogy+emphasizes+the+roles+of+quality+planning+quality+control+andPDF 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_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 16960 bytes
SHA-256: 5e7b1cab70b007dee862cfde8c999a3c4584e0d17e74927670691b4524f7fa1c
font_01_sfnt_off00015cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB8 11512 bytes
SHA-256: 642155b0fcb1f5f6d1a2989cce4833b2ebe28dca9c4ab7a08abbcb3adc1f0aeb
font_02_sfnt_off00017763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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