Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aec1094c5fec3a9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 16:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc01ed45b5e092350584f719d84e49f5 SHA-1: c75384fb44cbcb8745171563d7b1713d15ba9b7c SHA-256: 1aec1094c5fec3a9502908404941703778c3228a884bcb811c01d186ae4969dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=yay+gif+funny PDF link annotation
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1ca307afdaaa89729cc8a14ea572dba9/99045075546.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/katuvozexesozadivukefosus.pdfIn PDF document text
    • http://minhanh.com/files/10867958335.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/56171068481.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/81368546289.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/pumudafedosazud.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/zodejaxidere.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071425104589.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///vakalewupimadi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83214699084.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/282080477.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f9b9e9ac74cec43e7aa4abcc6e61a9b/zalegulubezulinubim.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/rokevuvelodiwapevuzane.pdfIn PDF document text
    • http://bankerz.in/qpic/files/21583683288.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/lugabidemewikedezo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/42973514747.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ab9bbf32---morobuvevezulorubunoxe.pdfIn PDF document text
    • http://nensi.si/upload/file/vixakegewiginenon.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/sodulelexetovezubogamogus.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/54695241541.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/72517233312.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/91406039939.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/pitozimosov.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/15749163572.pdfIn PDF document text
    • 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://vzxfunnynimatedgif.blogspot.com/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_off0000be15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE15 18580 bytes
SHA-256: 7ba23a736319283ad8d44408967b2fcea6b3d860cb3edd73bfa31858123caaa9
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 9924 bytes
SHA-256: 182b1d0a09dcce3dbdc05ce1ede8b291cf1da3eb32c70619b05d9c69a53da6b5

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