Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d83830da8f18a7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 01:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8a31b13421533113f9c2d176d52e878 SHA-1: b52b8c36cf0030c3a2ee1f6b98fafacc80e035e0 SHA-256: 25d83830da8f18a754de66368f6d60dd0a26882c642838fcc4b69140e7c9c7b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+the+best+android+theme PDF link annotation
    • https://implantsdentairesdesmoulins.com/upload/editor/file/rizuwi.pdfIn PDF document text
    • http://rongqichem.com/upload/files/wafogetut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136452a6be98---57049161636.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77053848848.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/05c7a7d6c6b6c556281b017594c278c0/7658112067.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/nakasefitaxeva.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/54112718440.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906153828.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210911124657.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109180527231143.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/50492890240.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/13843883675.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/91911032101.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/verafemulora.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/xawokogasotoluz.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/24528534084.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/84175340220.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/30067043553.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/36691489293.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/26203013031.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/2728521165.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/dixisibuvibotizonugo.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/56327064066.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vuvojuwijuwutaromu.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 18132 bytes
SHA-256: addb02f6505103d8fe9694c6b4601e4d8f01790a54f166f03f2040108700f52b
font_01_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 10600 bytes
SHA-256: e7965ad6c8a38d3785fb71dd57d6d9c5cd5705fd4a71db4feabaccb257bed7a2

Open this report in the interactive analyzer, or submit your own file for analysis.