Malicious PDF — malware analysis report

Static analysis result for SHA-256 de007cc9db251e8c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 18:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b542b6c6a4e32c5a3693edf17b13aed SHA-1: 7c612f55d9189017512cabb2355ddde503ac7f92 SHA-256: de007cc9db251e8c4cf15dbc6b68ead5983733c8bfac28bbb77ce6531ab823a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cbconsulting112.ca/userfiles/files/19977731709.pdf In PDF document text
    • http://kartelabasligi.com/images_upload/files/36344519055.pdfIn PDF document text
    • http://polkovnik.su/upload/file/jojelowugifegavojefaril.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/tinebig.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/88526113794.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jedapatiper.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20644995296.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906210824.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/41012629988.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cd450f72a7ff82728d37d65c05d174b6/25586962336.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109081952019322.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/31110601419.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614730bb70361---35101417602.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gidefu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/tinovijafikiduxapajetagep.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16a0167eeea1625ff1f5dd4c379fb863/zurul.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k1l946i37hp9fkjnu0fdb7i0um/64843852572.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109052210157963.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/84406644301.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/36254513669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chasing+vermeer+pdf+freePDF 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_off0000abba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBA 16324 bytes
SHA-256: 2a7c515db9102e156806a1bb57be46c3b59aec08a3b54ddaf4c86a4e9fe957d1
font_01_sfnt_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 10780 bytes
SHA-256: 48228758d5e86b6c4fa61ab16d8e3d081c7cbc983fc07e6feb5e0a5ab0f69c89
font_02_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1