Malicious PDF — malware analysis report

Static analysis result for SHA-256 684eb63c5c441bcd…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 09:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89175e977a91cd6ba2d752b1c3dc3e65 SHA-1: 2c8be9acbf84ab30bc6486f0f87b02f972d9d51d SHA-256: 684eb63c5c441bcd4a8ce14b58d7432e11c37e19b3a02284180dbc3cf471d813
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a malicious intent to redirect users. ClamAV detection and ML classification confirm its malicious nature. The file's structure and numerous external links suggest it's designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63a392c8---duwivek.pdf In PDF document text
    • http://kasargod.net/uploads/file/34558972046.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/79eco6uklbs9n95gk5tt9p08m3/37712658966.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6092b4ce---90526450253.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///zuseka.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/sumazufo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nupase.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/muzatonojek.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/85055104289.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3r57afretl1nouuc9sk130q2ce/5360525763.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0044275d2---xosabijekemor.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/187d06e57955fb49cd5962de1d58def6/ruremujabafexexonuveve.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/94415228192.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ef617402d8c3ba67853570a188dddcd/71837550811.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c285ee74bd8---68085335935.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/dokunozidemasexufikufizo.pdfIn PDF document text
    • http://sbairs.com/datas/files/lozupesubomogewaliwos.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/6101666717.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/8525984302.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/wiwivozumazumuvat.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/25049086703.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607006a65651f---gilofevorupomepofade.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rmd26hhhd8o8rko1pb0r0dvu90/11924316358.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/4035282363.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tezopif.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/13166373347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=timestamp+photo+and+video+pro+apkPDF 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_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 18588 bytes
SHA-256: 9a892ab9fab424f7bc6602c55ba325b025761511dae3ace366365ab41b27df11
font_01_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 10732 bytes
SHA-256: 37e0522acab74efda0f199e81ad2ad94897deec93c8fd2a501dff67477a5e85b