Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d52bf52832834ef…

MALICIOUS

PDF

86.3 KB Created: 2021-08-18 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ba52c029215f99e063a97d9879bcec3 SHA-1: 0681a3d15a37b49137f9909df57750b3ecf5b6b2 SHA-256: 8d52bf52832834ef1606a39c9992a5bd88852f6566409aeb4e3144c528abc361
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some of which are hosted on compromised or disposable domains. The presence of multiple external links and the detection as a phishing trojan suggest an intent to lure users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.ferm-matic.fr/upload/file/23209039750.pdf In PDF document text
    • https://tybistanbul.org/resimler/files/jozadivopobafov.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/32855685994.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/dozuruguzujimun.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/vewurupovedaxidamaxize.pdfIn PDF document text
    • http://195exim.com/datas/files/52854996447.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/83104896290.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7uka57af5tp88qf3asmbi2td35/pugaja.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/79041621034.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a768d7263---25676698157.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-13/20210713220719109097.pdfIn PDF document text
    • http://adveotec.com/img/file/48477377774.pdfIn PDF document text
    • https://kuepancong.com/contents//files/36952685227.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/26038432505.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611359cd79992---wuzojekesawu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nafomubinimu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/lorozo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/60827893626.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/51650065412.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/velareno.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/malujo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d23d1c50e32---bakasopaxazefepiwexi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611713c989471---70335528199.pdfIn PDF document text
    • https://dm288.rs/slicice/file/48009462248.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/tejadasewegevewid.pdfIn PDF document text
    • http://dogable.de/userfiles/file/99730364344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=javascript+the+definitive+guide+seventh+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 11008 bytes
SHA-256: 8186684671224dacb48a9d0c7c778cdbb53cb9ce52b4480eb9f6f334663bc12b
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 17012 bytes
SHA-256: 5bb9d3992776e558ca4ee069f277bf12d78083dfc9dbf110b106d48e64090e59

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