Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc6cd9f65875c3…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 06:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 231bd52d41164a2733d5272eadc4598c SHA-1: 36f016f1673d1cd5eb2598b0e12c63ca1b889f3c SHA-256: 78bc6cd9f65875c3ad2dd3ac80acdad98d6497347f8eaa7891c8bd80e44f180b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that lead to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, potentially to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=download+mod+castle+crush PDF link annotation
    • http://dolphinegypt.net/userfiles/file/1324682412.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dimisepamowiditilokededuw.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32172136712.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/jptm8hrg7at5a6jjk2pa7t68f7/57985512525.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/29527534528.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/86922646694.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/tedomorolude.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fevuza.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wumuzafom.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fozav.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/zibulikebefiwewupukave.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sovivez.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/xepuv.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0cd5a08f476ecee66bbfb9faffa1fe6b/91763007564.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109151447117948.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/dutejitizapimi.pdfIn PDF document text
    • http://soc-in.com/data/media/files/52639787729.pdfIn PDF document text
    • http://djapm.com/userfiles/file/gikudivovufugezewabu.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/mexupaleseguluzab.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143f1b1123a7---94977862797.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/41044707434.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091021532842.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe07b3c10---poxabuke.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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 17320 bytes
SHA-256: 8921fcb1480fac103f44e6d473a13a02c667168ff1715a31e1dccdd61b4777d0
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10728 bytes
SHA-256: 90e9087670284f63d37a929fbef634e3be4811f278b5feb612531078fef923ec