Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c47edf1eb64e55…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55efe1f6231cbf0d48be377abe52be12 SHA-1: 3a6b531f75a1ceef6b748b0e2fbc5a4bdf4f6353 SHA-256: f7c47edf1eb64e555ad89abcf7c91731deacb80239b1b3dd8f97cfa2d68e09df
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. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, indicating an attempt to obscure the final destination and evade detection. The primary function appears to be redirecting users through a series of links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ersatzmonitor.de/userfiles/file/melorozulum.pdf In PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/59580019936.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/vanodutaketowipi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/59q917205jevo23blvqr90ou74/82388457624.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/puguvisokebo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1288d630a5---72693364621.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899cd92170b---midiwo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/gusigetodepegugujababu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fakekig.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/140435010.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607963131809f---19166933481.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tj8e8a74hu0c5cpi2gd73u6ddc/vuwesudujazalokipo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/de91deed6fcdf4786f3c455b63483c95/xamuwedasozemeda.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/005010d3fe82af65e304cae2fa6c2afa/kokek.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/u4q5i4v7mevbpre1ecu99f1sq0/govonamux.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/xebizagevozebadajefo.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/94838253783.pdfIn PDF document text
    • https://magerp.org/upload/files/15410205031.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210826045743.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/xixodo.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4045fb71c022e45eba364609f686d6d4/timonowudafoteluvako.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/fipinekor.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/45038105427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=letter+tracing+printables+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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 17472 bytes
SHA-256: ccbf79b7eb0743fd7ec6a8f3150a69e3e388ed12581d9d4825a4b813b241640a
font_01_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10772 bytes
SHA-256: 1e4fb7f9f21b200e1549b130b639ce0dc4432b156fc558b01e845ba1809f2e64

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