Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcac2a203f9d2db…

MALICIOUS

PDF

82.4 KB Created: 2021-07-26 14:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 295b948ee7a15640850a00551e26a29c SHA-1: 708fc9c10bc8709700adaecc457896925b422073 SHA-256: 2dcac2a203f9d2dbfee4a18fb1a14995b90f77e00561e7de0a8a99c49dc02f0d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links to potentially malicious sites suggests an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7252864540185efebc43360f278bf53d/35839368518.pdf In PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/38417229934.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/11427904220.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086724f37797---65093593408.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/8314469127.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/36913834113.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/xewetugososakoza.pdfIn PDF document text
    • http://polkovnik.su/upload/file/darojogozita.pdfIn PDF document text
    • http://sport-jicin.cz/dokumenty/bisanumibatazagafunub.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7056413bf8---88064354311.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/72000632861.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/18685545273.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4jejst2l2b6aq5nnpt3abrv248/pinagotir.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/jekadewisu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qobgm98feg0prcuvd50bu3gkd7/biliresoletemakobugodofa.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ad301bda5adcfab6ca5f20761d2a69d2/67976800106.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/875d3975b489ca06941dfb8d48576b3b/207328214.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ab491e6a---24550622782.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xugogimamuwotaton.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r5fa463n6uq94pkhpn957gtc5u/46487779673.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f32909c4103---felusafutuluzusu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef8d89cf1---82194232500.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/sapilawi.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/votanevusagimajijidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ickle+bubba+stomp+v3+assembly+instructionsPDF 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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 11168 bytes
SHA-256: 45fc6ba48bc4a6e3adf94d0a5951f662220ea2ef8478432dd838dd96cae866b7
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 17224 bytes
SHA-256: 20b2ad6afac90d7d84cda385b8577fa1d69e8e5d22f998f39c3dd10a4120f70f