Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f922e07088d70…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0cbe16230f1916a00243bbd415c6375 SHA-1: eb41dc1da34654516640149d6d1271589da0a232 SHA-256: 437f922e07088d70f6dfa802fc188cece19f50b87e2d3be923c11f716b8d98e4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install remote-support tools, a common pretext for social engineering attacks. The embedded JavaScript and link farm behavior are consistent with techniques used to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+use+android+as+second+monitor PDF link annotation
    • https://jnnjhansi.com/userfiles/file/81871676548.pdfIn PDF document text
    • http://bamor.org/userfiles/file/79205484765.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1091e9b8---fodipuritaketo.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/4422870097.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/53845067187.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/64506040208.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135328c4d754---7785451734.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f801d1eb545a340e24dd6d005f8b2423/71076505075.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d04ba1253---sosobajake.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rowuvakulavufofawazapi.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/17186774876.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac742862b0---92825080300.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/nenipirifisasamanuge.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/99691621152.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/81253676041.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/49036920755.pdfIn PDF document text
    • https://blugarden.eu/file/lopisenapexaxun.pdfIn PDF document text
    • http://ktcz.eu/files/files/71872323423.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/dajim.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/64203610241.pdfIn PDF document text
    • http://giacongcomposite.com/upload/ck/files/nanomufog.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/60035931513.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/kigevufojezinixoput.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://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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 18084 bytes
SHA-256: 8ffe264c1e27b6886b89d2b81f9d68ce397388b03b8bd037a7847ea084ec4545
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10664 bytes
SHA-256: 2f7257c3b54ee5e0517e6bacc3d874739ddf5b6e208e012767814ca63bbd338b

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