Malicious PDF — malware analysis report

Static analysis result for SHA-256 42797781d902d5bf…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 08:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1277e8efd56f55a49bb6d269ab8d5ede SHA-1: 788f2ffc973edc95f4c38cd8fcc9cc42ee41479b SHA-256: 42797781d902d5bffd0a4039442d9c72ebb8646a5ae6abc2eac3fe02520ef256
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://castudio.eu/userfiles/files/35554967716.pdf In PDF document text
    • http://autowassenindex.nl/images/uploads/67148337823.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139d38a4e1b2---96249707169.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910102848.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/64643210366.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210910234958_640922138.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/65456957379.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/sofovujemad.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vf3a6sojq8hqvbnti4tq83va5p/35009798017.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/60tvc78imm2klttc4vv22hmh66/20630467291.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/57273589731.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/toseper.pdfIn PDF document text
    • https://sim2007.com/files/zutafus.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/59646288503.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/20579770819.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/4955698570.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/foneterisa.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99663371985.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/lobodujumosonovexonemiw.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/52840248784.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/65tesb0j7det3tkkun1b2cph7u/dibazaguluneno.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/99468768208.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/68744096119.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9de51307---mutojomepuxanisipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=private+sms+%26+callPDF 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_off0000b2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C2 14940 bytes
SHA-256: 4c9ad64a6ac31916708b3951dcb920f90fef5c1c1f8f12f210e46fcc5ebb3de2
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 10064 bytes
SHA-256: ca069bba9474854dc198aa4a63369d6db72f3f67a224159655e8f16f49b7c2c7
font_02_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1