Malicious PDF — malware analysis report

Static analysis result for SHA-256 d160772c598c026f…

MALICIOUS

PDF

77.7 KB Created: 2021-08-22 00:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099cf4a33d100bb4bc1ee7f58c77367d SHA-1: 1b99c7dd27654cfce57b8e1c9d5fe7d3b3c3702c SHA-256: d160772c598c026fda8c5c9bf04ef809b7cc25e260b295e799b670851917acf8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites and disposable hosting. These links are likely intended to lure users into clicking on them, leading to further malicious activity such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3ebaacedd1aa6fc292d4148ef1ade5ab/32252705894.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/741d7bd5b5899202db6422ed6b29b4ee/ninotidigevobopiwemufuzag.pdf
    • http://abaj.cz/UserFiles/File/danugepipesineweturom.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/kavujugebaziwegiwazevij.pdf
    • http://cleanking.net/userData/board/file/72639002168.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f38e48695f---74057670831.pdf
    • http://viorina-deko.com/images/file/kuwojujatito.pdf
    • https://wrd13.com/force/file/xofobobaxem.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/u831sk3p0dftvrqsal7phqpq16/9662676394.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/823791625.pdf
    • https://aldurra.ly/images-editeur/img/file/digixezokabipixudipebig.pdf
    • http://fujiya-burbank.com/uploads/files/kimuto.pdf
    • http://eko-inwest.eu/upload/file/67664113889.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/zikepit.pdf
    • http://vamaconsulting.sk/userfiles/file/tanubusuvodevul.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/pomejotawijimuvifafux.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fec34b89---7771550312.pdf
    • https://mszukam.pl/dat//file/poruv.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a9630c64---4402826444.pdf
    • http://xboxheerlen.nl/userfiles/file/21704112073.pdf
    • http://vksraja.in/fckeditor/upload/file/zurivebejuset.pdf
    • http://thaoduocvn.com/userfiles/image/file/29478237775.pdf
    • http://hidropro.hu/upload/roruv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+much+oil+does+a+briggs+and+stratton+4.5+hp+engine+take
    • 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_off0000c8da.bin
a753b1c79820336c219cd5b567cad360d197c29dc98760057f97e83750231005
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 11648 bytes
font_01_sfnt_off0000e40d.bin
703ece982e4df27bd71e7566b7920681d57f845dc6d1fe82f030a30c6d6d7b23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 16888 bytes
font_02_sfnt_off00011025.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16792 bytes