Malicious PDF — malware analysis report

Static analysis result for SHA-256 101f1e648ecd4e12…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 07:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2d020c6f449b679d59c16f5da5243ab SHA-1: ef7b52bdd41882a9e8a6a9ba659781063b22bd82 SHA-256: 101f1e648ecd4e1293c9fe6c89dfffa702c9a798a07b32f442e31ecd8c1b92fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites and are structured as a link farm. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85251697fb---rizofawef.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609434c64ac27---29483257715.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/82439320182.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110bbaf515a6---kufidukazijinebow.pdfIn PDF document text
    • https://digireg.org/upload/firokagonepevilanen.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/jafegamurorodewonarikaze.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7028df29f0---93971961277.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/metamuxirazij.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/likemonatesaw.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a63505437dd---fejarewubijenaki.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/febuwejopev.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c42e63c3d---japonawi.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/karatomosavevofigevebida.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cec6b5a68---tuturikulukavupo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b73abdf27ba---wakaxazafiwuzera.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pujanenidewinatap.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/vijikirelopig.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2723e41ed---ganuvuxosinasolukupo.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/19654386460.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107011753206393.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/47516483334.pdfIn PDF document text
    • https://coil.hk/upload/files/27236786112.pdfIn PDF document text
    • http://adveotec.com/img/file/47415433956.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/22226924059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=simple+present+continuous+tense+worksheet+pdfPDF 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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 14744 bytes
SHA-256: f657dfcb63f6973af191a69ed5eabf3b0d2fe5db32bf8ce589b90da70e8fcf0f
font_01_sfnt_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 11076 bytes
SHA-256: 35ceef2b32cfef292c74bab566f38a33ff99880e0f302ced956195a94ef96f22
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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