Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae452bbf88bafe8…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 22:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ae2ca1e0b1daacde0f307acab3a643c SHA-1: 430dddf8f41f04af4beeaf9eb4c04ce44fefb8b0 SHA-256: 4ae452bbf88bafe81d1f616415e5d2c70a4f8090adf40c5a3ce566e508bf898a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress installations, likely serving as a distribution point for malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious intent through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/7cf8a76ae9749d43b2d3da8ea5c3db82/3560233031.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5860d41d3bbbb992872f2cbf7d617790/kelotoxozuxawaxizupudu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607607ab93186---liwafejatugixulivexerirop.pdf
    • http://dfh-consulting.com/userfiles/file/duruniso.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/02qef1mqnk0nb6dpr493f6aamd/1187245924.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7fce7703---27166330328.pdf
    • http://bellina.pl/userfiles/file/fokawapuvegupi.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f07509ff---95859880457.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/61718567370.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8937b3b9e455f975e242c026a48c4fe6/10154233198.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19500ce41---rujexude.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160943fef85a24---pudezovurujejodokutoso.pdf
    • http://dlikefulproductions.com/clients/875850/File/13367683099.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981ff1f1d00---66406325218.pdf
    • http://uleshuzatshop.hu/files/file/ginojofojifuguvoj.pdf
    • https://ka-base.no/images_content/file/4789052742.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/kunamedip.pdf
    • http://studioambienteterritorio.it/userfiles/files/vafoputireniruwepepesa.pdf
    • https://parkettworld.com/upload/files/55859121552.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608590d09c1c2---99835573715.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zukewove.pdf
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/58417734783.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092679e72c5d---38510143585.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/14206434399.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=photogrammetric+engineering+and+remote+sensing
    • 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_off0000eac7.bin
b8373c31a05f0f778af8c8b442a442938f3a32edb5153a413d16cd14f8c850fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10772 bytes
font_01_sfnt_off00010339.bin
5bf5b5e4f3fa5b6c3d18d5931fb14dec49fb830581296a833d0dc873ddf3ac9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 17640 bytes
font_02_sfnt_off000131a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 16792 bytes