Malicious PDF — malware analysis report

Static analysis result for SHA-256 596e05045ad4d97a…

MALICIOUS

PDF

102.1 KB Created: 2021-09-02 13:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d943ae4cea483e40e137d9cbb011d58 SHA-1: 0a748c4162ba8b1edfd0af32c30e4d811359588f SHA-256: 596e05045ad4d97ac80b053469d0c15d282bd287a8272e243f582c3ef802054d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

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://philabc.ru/uplcv?utm_term=theory+of+elasticity+and+plasticity+notes+pdf PDF link annotation
    • http://pwmtqatar.net/userfiles/file/83554654549.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c88e50a3dd68cd26c9fecba89bb93ea9/dezewiwevufitabawuturuli.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/ziroxof.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/lelazedafumipuv.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a52b06bd9---59383502460.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03459ae00---vedufek.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/kozitelep.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0ve81gorqe45e05r3v5vv4tpvk/35220016493.pdfIn PDF document text
    • https://aitalk.vn/upload/files/futiteruzotevijijizuxewos.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/n5rtpagbfllsv4jhp75lg08jq1/40564165076.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/24425120544.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/lalim.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/63650449303.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/87f24d49f9be9ef0a701a41e31e4b6b6/82825898642.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e45020e2cf83157399ada08b730c95b1/xebifepositilol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726bfba22e7---vunujopepadefolomerileve.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1625233527966112812.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3f58236368348a222f0b407c5c0ffb66/7041794728.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10910405266.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/rozadexo.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6n8tb114lnph432tohllqntro4/68959898080.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/17571391030.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/limibudupilel.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/85803976314.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/suxowukonu.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/nuzowoni.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 21488 bytes
SHA-256: df8e6096d5fcc84274642e37688eef0a28019700421d58be3fca404d58a0b5eb
font_01_sfnt_off0001505a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505A 10796 bytes
SHA-256: b87cbda5106e340bb6b414237f8bc9dfb46793eaeacc949d650dfb0be127e5ba
font_02_sfnt_off00016936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18143 1776 bytes
SHA-256: 5df3691c8e7c4cbc28bd9a15813b86c32f5266304be0e6eca3494cebcd22c3f2

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