Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c718d1abffef5bd…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 07:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b922ca08712b1225f7028d327c362cd0 SHA-1: 8c57907c1e9a4fca17b2cbdb4e6394d3b61d7432 SHA-256: 1c718d1abffef5bd95bc56ab11005b3237145c3174b79455bb2b41e54f104eb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access content, which is a common phishing tactic. The numerous embedded URLs pointing to PDF files on compromised websites further support this, acting as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751cfdf013---76371441071.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d44b8911b59defd42571c6068cd68574/32739540323.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b82a47e98---kagopekoxorutuditeginoke.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b860f447da22ff92ef2a04e366710385/96105610750.pdf
    • http://voszveszprem.hu/_user/file/64771262984.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/107bb85026774c57a1f986ec68b6c8d8/muzelelurenurenijozu.pdf
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/foninozaro.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/ragejaw.pdf
    • http://btc-ltd.com/upload/file/kumanusugere.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9133906dee4f8f6475145c19e8edf311/timewokatevazozipamigone.pdf
    • http://galettedesrois.hu/userfiles/file/tawelixo.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/jebanesidebu.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/34916257020.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/80b1826921c02f9c3d02ca9f51db2a9b/funobakenu.pdf
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdf
    • https://proxus.nl/file/zefopufedadovuwudimevixo.pdf
    • https://codecs.ro/images/file/dukamoguzibabazefawavugex.pdf
    • http://hnkingdee.cn/Files/file/202162334119.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8551f7d5---42471165265.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781548a4e5d---41819958795.pdf
    • http://alemotta.com/resources/original/file/kubugidokebe.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/foremopifix.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816410f11d1---giferejorufiguf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unlock+protected+word+document
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e849.bin
2115f05d9b54917456dacf68058ee2bbf2dc76769b5afb0ea5adface7e480a12
pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 16788 bytes
font_01_sfnt_off0001139e.bin
8ed5fbad315f4810b5986f6cf9ca9db72be72df3bcd6f30acc4562f7df6ba004
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 10524 bytes
font_02_sfnt_off00012b9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes