Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a1958922629d7d…

MALICIOUS

PDF

92.2 KB Created: 2021-06-21 09:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5811cba8e917a386a7f649d9c304adbd SHA-1: 3d722237c5ff70fae264ffd55bbf1836031d6534 SHA-256: 32a1958922629d7dcd070a16556db51407e1c32d4393e3d23d0247e773bda610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://hillsdalehorseboarding.com/ckfinder/userfiles/files/nelasarazepuxelifijelid.pdf In PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/25125817341.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/8qubsstaaptmdp4jpvqovml3jg/69989855086.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160835939ba6dd---xexujerininulu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c91dc27c0b9---nulisedodojofewudubo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/90515122238.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mafupamelalifusiwug.pdfIn PDF document text
    • https://baongochoa.com/upload/file/7400675310.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/69e4829bcad569f8b9c5da2ccbc4bda5/59528728321.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f9b4bc4f0e7a000803a2124307eb9572/wevoligolejafujod.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/febetujitataxekazan.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c009fb271c0---varutuwivuloviwu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fdf7a83115a794125387cae4c6a63817/13026819428.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa4f747a1---futemikidufipetizu.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/girememibenajilelelile.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/13074474203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dua+for+tahajjud+in+englishPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001413e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1413E 20452 bytes
SHA-256: f612e25605c65181cbe9838daa0fefb7edceb3641cab9bbb7050fd23537fd3d3
font_00_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 5244 bytes
SHA-256: fafb11086446e3ce659412046f34b4d6f900337c67c72e95361a9cd7ad0ac2e1
font_01_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 11188 bytes
SHA-256: 8405aee61632e9bb7b9d32c0a35212412a67794290f2afc52877f44ea91fdc41