Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3db1afbff2f394…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f0bcb4c7043b77d6b6492261cdb6c57 SHA-1: 55acbdaef6f29b9bdb4f11816bbe9b200c448bf4 SHA-256: 2f3db1afbff2f3942f4a5a50d98a3fe83f86efa3b635554eb471fd205303cb46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing attempt. The heuristic 'SE_FAKE_CAPTCHA' indicates the document presents a fake verification prompt to deceive the user. While no scripts were directly extracted, the presence of numerous URLs, including one pointing to a compromised WordPress upload, suggests a phishing lure designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0252126b---28699407249.pdf In PDF document text
    • http://isdoor.ru/uploads/files/somifig.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/89450523993.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/gagogarumapebutovi.pdfIn PDF document text
    • http://didula.com/img/file/gipemegeluwetizogin.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/47795115951.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/efdcde68cbbcb04a921f155bf7cd01c7/13119627229.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/24662940283.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/sujolede.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/noraduvogikutumogibari.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/tigaxugoxezivureko.pdfIn PDF document text
    • http://art-ball.net/files/file/sodaluzizepipaban.pdfIn PDF document text
    • https://istanajp2.com/contents/files/bugufixokivetogolukulavet.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/65690243046.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/muwivaninegoviremugedefub.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/18657419166.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/11d2nrb4ph1fgae6ic8loa2pr0/dijuketirorobibis.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/72791470758.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/tedebimojolarojikagotuj.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/20714119503.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gibosode.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/janetusor.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/38d619d8c906746c6180f159a3dabeeb/83851857296.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_235237.pdfIn PDF document text
    • https://activepymes.com/pub/file/75253272084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=onlyfans+mod+apk+iosPDF 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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 18260 bytes
SHA-256: 2933a0b3a76867ae4056e995f288489011082b95fdc3e44608cb8d8fe72448b7
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 10560 bytes
SHA-256: dc4ec03ddc996e1835029c0059a96458ca4e2396eaad81e30949d8f52bf0f283

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