Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce78e525404da46…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 09:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 019b7538fb9ef759db0d27f34cc1e520 SHA-1: 7a686bea63257b5a57f8340421415d7adf745b4c SHA-256: 8ce78e525404da46127a1677732efe503866d14a8004a6f5d0ea80e69fcf81ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The primary purpose appears to be phishing or redirecting users to malicious content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/99ec2977a1462ab8291b20080d160984/79679075679.pdf In PDF document text
    • http://aven.su/userfiles/file/kilididadojojuzurokonew.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/visux.pdfIn PDF document text
    • http://chapelguild.com/images/usr/71501363196.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c8cs7819q4dkheaudja52kfngs/76197290124.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bed7aba4ee38e2fe6bc1024039e94857/63841384254.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cke21s5liocmn77vngabcabm96/55970108655.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8e0e1312cc4457fac76e2d8d2abbdbb0/75134883476.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/94312239533.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d8f03309748f772aa2f0f5577ff05886/dagolusowojas.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/eg0bjfetslhgbgnfl29eicj5n1/suwusidadelunopitavalux.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/46983791552.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca12a14e3---nusufufage.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f8e3ae2c74ecae7eeb8316ee48bcf1a3/6326564192.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mawopidimi.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/ob67r7gmqffe6n1cvi5oaf6mo8/zaviwomarolidupete.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/52595378802.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e3d4ed9a8---vitigetozo.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/36954056638.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/28/53943922957.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/favikaw.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/80959231154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=possessive+adjectives+and+possessive+pronouns+test+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 18204 bytes
SHA-256: 9160b91f803763c36420aa55da461d2cdb491a5c3f96fcd792b1ad2afe3bbb75
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10864 bytes
SHA-256: 0c8666eaabbc92fcb978d2794003a8b48e64ecddb3af3dab2f9bb53b7665fb9d
font_02_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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