Malicious PDF — malware analysis report

Static analysis result for SHA-256 402bd199490c1325…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 17:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c98ed6afbc9b1f316451ce7d0d5ce1f SHA-1: 69c95cd768e92a7f26165a95529017c99951dabd SHA-256: 402bd199490c132502d726555abda4f942008de441e3cbe0b2609d0ce2f38562
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing a screenshot to obscure a clickable link. The presence of numerous external URIs, many hosted on compromised CMS platforms or disposable domains, strongly suggests an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a delivery mechanism for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.abcklima.hu/data/editorfile/magutofubukopufiwafe.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wowizazenefokud.pdf
    • http://szentimresiklos.hu/upload/file/63304909465.pdf
    • https://signika.pl/Upload/file/67617868044.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b3941e5910914c00c54f9abbc4a06a7/piwibiwuje.pdf
    • https://penzionradvanice.cz/res/file/vipizofowujot.pdf
    • https://lee-trading.tw/archive/upload/files/613360525.pdf
    • https://isgz.me/userfiles/file/53677286723.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4858223ab---rumavozawovobodisir.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9i4d72bcsek0olp9cms96r6p0v/98484204757.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/335fd3qt0j6rf9u3kdi6e5ml34/38548486006.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/dajisujeja.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b7c7b5fbf31bd7bcf73d3a2cefbb1f68/jumasozesufe.pdf
    • https://rainbowfurnitures.com/files/files/58889928495.pdf
    • http://aeusjtu.pretty-match.com/upload/files/8248991375.pdf
    • https://rafautama.com/uploads/file/63784167448.pdf
    • http://hanilkwanla.com/uploads/files/mizifosital.pdf
    • http://redemaisfarma.com/userfiles/file/85370195145.pdf
    • https://biomisszio.hu/tmp/gebevononezebipus.pdf
    • http://pradakshinam.com/fck_uploads/file/zivesepitidigegeme.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/lurimaxekenoduxir.pdf
    • http://polipack.ru/content/file/4768514535.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/vasatatib.pdf
    • http://poptheme.cn/uploadfile/files/20210921_150042.pdf
    • http://saowaneecamp.com/UserFiles/file/mawojadedudomajabar.pdf
    • http://sayarbobinaj.com/file/22086367479.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=6+letter+word+4th+letter+v
    • 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_off0000b58e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 16792 bytes
font_01_sfnt_off0000cda0.bin
6dd46d73ad69411393edfbd5672e8f7f7c79ae0c018075f78b2b34894d0fe844
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 14160 bytes
font_02_sfnt_off0000f10a.bin
a1d3f7e07718410c3124f62d9ef401daba86848e92dbe91fa2abf968f79fd3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10120 bytes