Malicious PDF — malware analysis report

Static analysis result for SHA-256 1982c911cc0f6947…

MALICIOUS

PDF

82.8 KB Created: 2021-10-09 00:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0020a645d10fd3fbd4db1820b3e8232c SHA-1: ec5c1cc8a3db30860daadb8804530cbaea9eb2d7 SHA-256: 1982c911cc0f6947bfe7f684449c70e7a5f74e5d85b5a3ae9245a3e511ede893
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pomtco.com/technical/files/file/42403291155.pdf In PDF document text
    • http://csim.jp/ckeditor/uploads/files/74222836491.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/60472491639.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20211001062130.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/42768565825.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/kitixuvi.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/siwaduxijezazova.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210916051135.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630962185/files/32776212658.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/pubufalusixijosofuja.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vejefepizowujur.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xulilekano.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/jezozatix.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/eabd9bb108468d2fb25cc2cdd01303e4/munawevorejesuzifubim.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/lejudogejomitimojaretapum.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580e7fa7774---vimazegetid.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7555bce9---51684238952.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/69455613795.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc38e46052bcab9c6739400a3e55c12b/zewoworitokotudemet.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/jirojizamolizonox.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/moxesudipoduwofujanumadu.pdfPDF link annotation
    • http://eco-building.cz/UserFiles/File/satojasetimitumeveve.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/58991094560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cells+of+epidermis+and+their+functionsPDF 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_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 11016 bytes
SHA-256: 80abe745a9adf83befa0aacc2fd0f55320e2f1b619631d72f51fac937ec2cbd2
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 17036 bytes
SHA-256: 17a764ea53739bcebeccbb42ebb7c45536075e236d31739d4cfc00efe85bd62b
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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