Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2beefb1cc7a085…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 17:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cf60329ff22329a4afb9fdbf0c455ed SHA-1: 4b0ed821b9928a76b39d50c8a500ff6debc58a07 SHA-256: 5e2beefb1cc7a0853b2cc72d10368682a5bdfb3af6889f0ff437b08442f4159a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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 https://laborke.ru/uplcv?utm_term=well+done+in+arabic
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/dacce7e56278a28c64bb667eaa4f3a03/vijolipagalozo.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804a1a8ec53---25297569976.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a2d3bab18ab54b11e6241adadec621d2/likopavupilamaguvu.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210621/file/16242756722704.pdf
    • https://dailyiat.com/html_upload/file/dubifavunijudakene.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12ce4d261---25194767312.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608915a9bd6c5---porosanata.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802269d4e78---82043974570.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210625_0718DD20EA3D6F69.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de81e78351---55004767962.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f537608393bf10017abf55119f1b20c2/20212906331.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58f6c701d---fofobulowuf.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec009a5df---katomo.pdf
    • http://ac-kenigsberg.ru/files/file/48976499975.pdf
    • http://hydrem.ru/images/file/zadaxalovanogojason.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3425db05---sajelabipepodozorugaduko.pdf
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/bonexagal.pdf
    • http://ankamet.com/userfiles/file/sasitotin.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/90008273554.pdf
    • http://poorclarescork.ie/images/novixiti.pdf
    • http://vasvaripalmuzeum.hu/upload/file/munanaxozol.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872cf886ed5---rotidijonewexexo.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7028512d---fuduwazifomawi.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c32a8dc268---fesimukejolowuxemaku.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/demug.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43e2b98c0---72374418155.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001076c.bin
3ca106904c9b5f7b93fad50b05514c7ea96d5a0d0cfc92f7224b2fd9b592fcc0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1076C 31424 bytes
font_00_sfnt_off0000ef5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16792 bytes
font_02_sfnt_off00013f69.bin
3e2fb82ef9fbe7d5be405be1ac94511e08b187c19185f17653ddb799f08fb0d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 10228 bytes
font_03_sfnt_off00015669.bin
1863786ec3e033d2948a484081fc43f084f0ed80a832d9f5784bb5bd483def45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15669 16780 bytes

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