Malicious PDF — malware analysis report

Static analysis result for SHA-256 578bb42ba0bcc8f8…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 08:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a15eb1d8fd0e8653ceb051a99bb6e42 SHA-1: ce09bac5bd4b431b8d77e670404c78f83992b1fc SHA-256: 578bb42ba0bcc8f86eae1a715d8c8419e03a188a64ca22395ef0b3989c746356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to obscure the true destination. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e34377ac---jukovonugedafedunarodiwuk.pdf In PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210811_093302.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210820144233.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zezazoxinepofotodol.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/lakamapotuzifidefegatijes.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e371764b8---repiwiwigisiwetivu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/daxotawigelo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j4fbjtiq3phfi9qlcod9eno484/72177387534.pdfIn PDF document text
    • https://12shio2.com/contents/files/97765518638.pdfIn PDF document text
    • http://findusafranchise.com/files/files/4543717379.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/titep.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/654ab9713cac9e20c0d1a01bb0aa3983/44580436384.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/34053335909.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/romexivovamajakuv.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/30887005123.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be916ea2ae---ripefolifopibefuta.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/piviwujolozovizidigeboki.pdfIn PDF document text
    • https://arendic.cl/files/zutirurelibutigamakaz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2bc279782---27148334550.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fac633a2aee957d6fcd1dbca3626432/81058012611.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/73783628451.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zetelunudosumorajufifem.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/d9g1plin12moqshv1lfkj0tfqu/bijisomasejuzusukizenifi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6ab4bb3b4c41cd384b466bf36698caa2/buzokoxidetutevaxozarapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gated+manual+shifterPDF 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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 17796 bytes
SHA-256: 3feb5864301992dee102de453f12ec265e499d1b6689970da941a35b2429bf82
font_01_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 10640 bytes
SHA-256: 990b622deed801984888b6b746cf8315ce90a100bb54f009a1c5982fb71b0d01

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