Malicious PDF — malware analysis report

Static analysis result for SHA-256 2371c16546ebddb8…

MALICIOUS

PDF

90.8 KB Created: 2021-10-09 23:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b1e5b39fe9b37fa16c935d65f344b17 SHA-1: 2f3c8a6ea2ed027f6df7b2f49da64c4bf5f267fb SHA-256: 2371c16546ebddb85b8b006043e7730cd53539e8a4455be51e8cc3fe216104b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eco-building.cz/UserFiles/File/30815702294.pdf In PDF document text
    • http://train-in-japan.com/images/blog/file/vezuzimakekus.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sebabanodejezovuvewosidi.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210917033306.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4de3dc9c622d6e3f4d3e64aa62183396/8408868307.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/javuluwi.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/44816345802.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/poradadawejofizelawitawor.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/71556416740.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca86aa3abc---nipajokejepimopumozawu.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/68277315072.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/mefulexiram.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/81913689381.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b72b9aca---susufimafarowutat.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/raporobidawuwekutujo.pdfIn PDF document text
    • http://sgpeo.pl/users/file/vetijimamibare.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/tibepefiwunuzenulovimi.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/pomisexif.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/52e9b734a280190913636c4bc3e5c16f/15289495926.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/lijuletasapuvesemibutoses.pdfIn PDF document text
    • http://bscartridge.com/pic/xunugidajanajekufopol.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/rewoxozuzu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161568a05b5e3a---69891561340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+quest+builders+release+datePDF 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_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10808 bytes
SHA-256: 9aa5eccfbf9f5e9f064c432a0de80e9b9c22107fd90d11534e7b214537a33402
font_01_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220B 22992 bytes
SHA-256: 6c89b7f415c2ca42cef8b498f28eac3c27ed6679f2bdb1098eec70b7046b7835

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