Malicious PDF — malware analysis report

Static analysis result for SHA-256 874fdc6ba1d7e23b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 18:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d725522c9e1ce7cc09b951436532d20 SHA-1: 6d7ded2547982907a85595a1f88ea6a37a901c66 SHA-256: 874fdc6ba1d7e23bb26d438513ebec26f7a1835e0b325efcac06e31d5317753e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=literature+review+writing+pdf PDF link annotation
    • http://exosportsante.fr/ckfinder/userfiles/files/41765463777.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0cee0ea66b2512fc4c754777175aedf8/20107606888.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/12663896451.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/laninapolasako.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/2175564632.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dd6c515ce6a86d669d680c8ac8c843ef/wapif.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/61422163871.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/59369307650.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/14230038737.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa76532f7f---69766728780.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c4f7fb53---siwedesiz.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b386a1ad---28426553014.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/65067483100.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/76381825195.pdfIn PDF document text
    • http://allycatering.com/userfiles/13548310747.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f810da2b---23710591668.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sekonuvaj.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/28305527139.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/polonakubanunenaxukulux.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/1d5ebd5cdef31585eb0346c51c843b3d/57911057712.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/dolatabidujukumakozefo.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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 17824 bytes
SHA-256: 7602cd518dabe84462afff8bc1283b85765ae2ef7e523fdb672a428983bd9f7a
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 10548 bytes
SHA-256: 26ab8d93576da817313be0d05972cc9f6abf352fd2e721990da584714ffba8a3