Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e1e6a0a7aed578…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 01:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ce80f65bf624e62f43ea385bdb9676d SHA-1: 8aa6761d60613a4756fa196c5e8d8c260e175b95 SHA-256: 92e1e6a0a7aed5780666f19e3f21a354561a947603ff9b791851ac2a99f3d9d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of screenshot lures. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://ketchas.ru/uplcv?utm_term=encouraging+words+that+start+with+k
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210919050217.pdf
    • http://myhomeinparis.com/userfiles/files/87065003543.pdf
    • http://investgeorgia.ge/userfiles/file/83670070330.pdf
    • http://huucodatlanh.com/userfiles/file/93113593008.pdf
    • https://nocnepal.org.np/ckfinder/userfiles/files/83491548743.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130939483020---87411205956.pdf
    • http://gaudi.tw/upload/files/13793075866.pdf
    • http://www.rajpuc.pl/pics/file/konuzewerokasovogotox.pdf
    • https://bellcera.60km.com/upload/files/78137187.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/vixezafodadod.pdf
    • http://oris-am.com/editor_up/vudupufixutiziv.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/81628622700.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/19234917425.pdf
    • http://snbedu.com/uploadfile/file///2021091308070269.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/gigikisoditulibojoxufileb.pdf
    • http://modellszerviz.hu/userfiles/file/96321124253.pdf
    • https://coastalstudio.com/images/main/file/29519957796.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/nisakidixaxexituripepit.pdf
    • http://piqiso.ru/userfiles/file/14081330715.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/168697f24ce5fcd5852144d75ea89b6d/92678771095.pdf
    • http://ff-engineering.com/userfiles/files/37757512930.pdf
    • http://telesson.net/_UploadFile/Images/file/37174535512.pdf
    • http://packturf.fr/files/15650609102.pdf
    • http://ttmplus.com/userfiles/files/zagibetejijagewuzor.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5298c9fac7005632e1fa9fc9a3ef9ac4/xebaduzoludedu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 16792 bytes
font_01_sfnt_off0000cc05.bin
7930681bef758d38f2028718a74c38a8549bcbce842a0918350a3b710b824ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 10732 bytes
font_02_sfnt_off0000e47b.bin
0dcef83d8bab4c6211167f3c5a11893ea13132343d0ffea80b58474874a4e45f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 14444 bytes