Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d7a2fd40371134…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 17:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd3b48cdeabda9482a0ce6fce3cd3691 SHA-1: 73ebd060fb441495bb22f51d3bc78839b1749e92 SHA-256: 33d7a2fd403711348407eda59399f7e41ae69692090ddd5817efc6ef0eb55e3a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pierrevillers.fr/mairie_files/file/99604620105.pdf In PDF document text
    • https://anmoul.com/userfiles/file/matawaxarub.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/sofitir.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/44900598474.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/nifan.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/97330618023.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335f76d2c36---22429638311.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/merepitux.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210905190752-29415210693.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/kezuwovilarerazijasoki.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/nizukigasezo.pdfIn PDF document text
    • http://kodemari.info/data/files/bokurimorurebepob.pdfIn PDF document text
    • http://grimastone.ru/files/63605157337.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9faa79280---35063374701.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///garukoxubeboranimenazam.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/51656622901.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/6840109840.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tftb8ieps9tue13l1hkkp9gp65/85188349768.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/78620735419.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jarifibagamilanu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/wupinag.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337f91ce242---46478451881.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/jiputuzubibolixanamedijo.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/5576758327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cloudy+movie+appPDF 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_off0000bbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFA 16724 bytes
SHA-256: ee7622bae094d07fbc474ee4524b749617dfa5ed2c6a9ee5a9c5ad703f940d41
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10396 bytes
SHA-256: 2367d070b33b6980dd8cd20f2c630c2e68c8e67dcb80a096d9e0e31792578854

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