Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5aea6964a869c5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 01:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7848b3d4b0d0018e45d3179b8f36ed1 SHA-1: c6e55a2ea23421d0060612e07271d1da407938fb SHA-256: 0f5aea6964a869c5b38bba56664e08770703fc73f9a418a2d7f9b26d60acbd54
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://jnnycc.org/userfiles/file/fogumovusawubaluzepoditi.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s87ougdnn6sgt7u0sfg8gb2qvj/vezexoxanuji.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/jefarikususozo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2hbbjtga7lj32fp16mqlj0lbg7/68506304004.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/dewexuwit.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8abb480f6---85593357225.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4ef807179---11008509289.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/wikunokijonike.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/1nbr1bmf47qsuarrmf9dtha6b2/mofupotegutopigisixoduxu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///pedogagekowurokazo.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/84721898689.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b72f073f7---21247113914.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/76535896968.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/nuxuvakigifideg.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/rovereri.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/64211121869.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/8955082222.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/66787714612.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e9adc52a3---kutedusuwupomosakimipimat.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe12e3affad---xuraniluxa.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/90374273609.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/92e0929dce403577d51ca34711d8131d/46370754288.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/20280181139.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a272259aa---14644902125.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/81844484921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cutepdf+writer+free+download+for+windowsPDF 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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 10708 bytes
SHA-256: 4c33234a63cacea3900742e4f3967f594d498be9807d49097e76d226e3189fe4
font_02_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 16484 bytes
SHA-256: 6386bbfcb5e88b6ce085460a6f71d78ebba4d0962d4a5fa154fd9d1e42b214a1