Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bf1acf298b3f48…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 21:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6504902731a8e36c7a535da868a19dd2 SHA-1: c8940f7ee00c788c91c63eccd900bc3fa94c7017 SHA-256: 87bf1acf298b3f48d44c75af98f52fae352955a3eaeabc88b3a2d4107b532d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a phishing or downloader attack pattern.

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://huntic.ru/uplcv?utm_term=current+affairs+objective+questions+and+answers PDF link annotation
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/nng0kg9laufmlphsdmnofe932l/12991266089.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49a45a9d5958c21b2b457305675b11e7/70638181718.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fca1841e7---49686859358.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a0b31a22---konux.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/71r89mg3165mmlf4nvtk0rf4nn/zilolizitofuworavuke.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eac1b5990---fimupedimezozifesebuzivib.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/80288887167.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3ed9206ca5fcf2cd6fc5209d8d828a18/94329167629.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45fa8af31238ef5cf9e700cba2d6017e/50511071578.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4dc0d50dbc1292a8a41f51147c2d86b6/lufemuwilabajatufex.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6f4f3631---nuxerol.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/45623546143.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/34108f0e4869140616b062ff513c8810/sesewi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1bbb130e7fa58e5136ffdb35e833f989/31391202506.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/sokav.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/60400866047.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/6247150023.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a551c8129---durakud.pdfIn PDF document text
    • http://cocoal.com/uploads/file/devuduwit.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/duxiwinemewazugege.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/10376770696.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/749501125.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/dezenegewazujef.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62fe54845---xexoke.pdfIn PDF document text
    • 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_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 11124 bytes
SHA-256: 803dd97b7bbcf0451115dbc799b373b706380f1dda48318e0d97d86b4cbd774b
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 17904 bytes
SHA-256: 40b278bd83f4bbb9b14ad340bd25dbf0f455b89c092cc72f812f0575ab85de65

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