Malicious PDF — malware analysis report

Static analysis result for SHA-256 71785d68aae0179a…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 319a24307efa85f8f58a21b557e44bb1 SHA-1: f60e5683cd5e8808be4c7352dcbac91ee5565690 SHA-256: 71785d68aae0179a8950d9a6de4b92e97798b842ae1e02a52374fc00f8f1e9c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kor-ra.ru/UserFiles/file/xiguworivezoziwolosonomox.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/etgneout22sg5t44ronjkr5jp4/guliv.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/40464298568.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46dbad0ae9---xixodibadi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6nojiir16q9fs24t1u9jf49s2l/nogosopefisutopabazajov.pdfIn PDF document text
    • http://isvpro.com/custom/files/babotuwukuv.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/63471671987.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0a81aef215285bf02aa10a849c504d08/7721589776.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/04b206fa7b8a57d1ee36fb846c453b83/dosesujemav.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fd2b8772e99e351d03bdc5f5accd7927/lakumomupen.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/91092162881.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae99d7d855---40763769933.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/54429957503.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd7a8584e13fb75a6b6d87bb00a7e139/kuvonaseviwo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/wadekavejuwo.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzutejojamotumeron.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe031e5ed---rujezagimo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/c481g8tdt86hpclimqp5e27li3/rovejoborigojog.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ffi0qvcr5urbp9edoud4in7125/55113169363.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f6cad065b884fbe09797f973bfc4e291/16539546364.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/6215717280.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/64268095805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+connection+between+two+peoplePDF 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 19848 bytes
SHA-256: e7719c3729f860d5d75d561085ae5a8407acbf929ee5da3727f33b839b76f428
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 10144 bytes
SHA-256: 2471674cf471d32facde76b1105e365ad72e2c0d62eac5ae000c56ef9cc800a8

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