Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bdf3bf5af12558…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 14:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88720a0ef150cf6e6d441fb86263fb7a SHA-1: 4c1b3cc707effbdb6a7f2ade986fd13bf60050cc SHA-256: 05bdf3bf5af1255848769f36a84d9a65f10c9d34774c041bb7838be1e6613e38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites, some of which are hosted on disposable domains or use UTM parameters for tracking. The presence of external URI heuristics and link farm detection rules strongly suggests the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nujhimachal.in/img/uploads/files/78954668756.pdf In PDF document text
    • http://ranch.pl/files/file/4994268620.pdfIn PDF document text
    • http://decorstore.eu/upload/file/93957227647.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/timemunoxewimanuxoje.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/tibotujekexifesitilus.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142939423c35---demegufiderefadud.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/28734007068.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/85816697707.pdfIn PDF document text
    • https://medpressa.ru/files/file/gagekirov.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ff120f450---domesukuzufivez.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/92853366348.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///zenerogidet.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/2810567046.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/rovijiburugomux.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7mm7v6p3aeapjarq927cu76qlf/wixan.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iq1k7ktnoggsd4k7jh4g9j1svv/leziminuvopozenulibet.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/2dbe7e805628032ef98e9053a82db021/90387615323.pdfIn PDF document text
    • http://guitarenko.fr/img/files/tatadefu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515bc17681---48358794306.pdfIn PDF document text
    • https://gangnampools.com/contents/files/bebogarolinababidebemuz.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/44246229776.pdfIn PDF document text
    • http://njxinbell.com/upload/files/11712262502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=do+battery+saver+apps+workPDF 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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 17380 bytes
SHA-256: f688869322b86891124946829407741113304a92b54186874e95f48ad14897dc
font_01_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 10500 bytes
SHA-256: 50a55aaa68b88324b4d36ab2a1559083d1d0f559b572f6c4e8b3532d139d9b14
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1