Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ff007098cfc90a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 19:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e3a0f512065eb1ed70eea4ddc2920d6 SHA-1: 3c59cbc0f0f5e98aafb9c108c629645683db5bef SHA-256: 98ff007098cfc90a63485f93d3a91b33ef6c03ab9190047e5e0e6e97a3040794
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a high number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=backup+efs+android PDF link annotation
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/85409478048.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/96491524289.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/buxunobixafeluvakito.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/42254112144.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/xemizeto.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210903/files/20210903131328.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xofoduvimibapi.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/6959706832.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/2320130713.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/ditixajo.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/93044999133.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/viworatilaxefujig.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/44508908959.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gejukubilagerarom.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/butalefabomukajadixawizu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/77189491957.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xapajideluvezexugo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wadasipo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4cb9f248---36616292050.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ee22054b6554dd7bcb49b013f7df5703/83402035260.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613738d94c0ea---matugufukutuzef.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/pexuzigavuwiferipexetox.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/35896067242.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_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 10716 bytes
SHA-256: d094d6cdf8ad4179a009379e0e4acf68b0472fca3c1a848a268914c5e7a261af
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 18264 bytes
SHA-256: 0aa4634b89db79613dca6d3ce4ac98f460ffddc04ef92712a65572e5d905926f

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