Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ee129c13929b5f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 23:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 14adc3fe51840d1ed312c49b155582f5 SHA-1: 808166eed4cd393ed195ccba6cde3da72d3b5a8c SHA-256: e1ee129c13929b5f3129955a4744d20430ee119a4ffe9e0474e750e7076c2579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attack pattern involving the exploitation of user trust to lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://weforyou.it/userfiles/files/99866769794.pdf In PDF document text
    • https://endeligmandag.no/e-brev/data/div/57616067786.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/40321730637.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/27294157036.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0ceba0947149bcc6b1d921634f1e256d/38988610122.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/488a582fd60b9f829812de5f94b68394/jazetuwumekux.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/3879642974.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/mivexuwe.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/8744866687.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/luvalirotawedozegof.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/30221579751.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139966b47d0f---pasebukuku.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/suwofen.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/9555666382.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137fddcef62b---wevetamo.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/kosowawatiparetigoxiged.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/61876458182.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/mujisoxemiwomi.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/nisufogojegisotuzefutox.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109060227149743.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/6223584836.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/momedutegewadunetax.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vavuzevusawujami.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/86985862508.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/53165125015.pdfIn PDF document text
    • https://bnovum.hu/downloads/tuwixelulir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=which+is+the+largest+countryPDF 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_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 18052 bytes
SHA-256: 377efbb8f3d60abf1f4e6cd27852829de672b3211007b716091db585050879dd
font_01_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10716 bytes
SHA-256: d28b171ad2ca10e6b43dd484d65ec47b6f8487b8d06a83d993d4c5db6d2c8596
font_02_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1