Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f03883217f3fd6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 18:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca22abc6c7413c05fe330c3aa83adda2 SHA-1: cf8f48d5fbf207d51cfde77f406ced651e8652b8 SHA-256: 45f03883217f3fd6ff994ece7f782fece25d15e21f4f642f64e1f263a6010044
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The heuristic firings indicate a link farm strategy, with some links specifically targeting compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://briztravel.com/upload/files/96898859859.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/furenononesuzokezasirem.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/27377473856.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/36996112191.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613512baa8a6a---pisirokevabuf.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/fiwilaxili.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/49085666904.pdfIn PDF document text
    • http://beijingteye.com/upload/files/waminoxizenulujixaj.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/38657660071.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442fb4e0b2b---doxolajevotusulunon.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/dinonolot.pdfIn PDF document text
    • http://offerparts.com/upload/files/tujipusibabidunil.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/fajazuxu.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/10422949047.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/dadijuwazukefi.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/99924187806.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/93255967005.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/80682401485.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/69176283703.pdfIn PDF document text
    • https://oasis-travel.ro/files/gitiwaxila.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/molataxumolodegewaroxo.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/pozozatiw.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336e9e53172---29978529701.pdfIn PDF document text
    • http://mobiliteit.nu/files/48511744015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=civ+6+apkPDF 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_off0000aff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 16596 bytes
SHA-256: 25548435f6ea593ea0140e2f325d02ac02c714273544e9484bbe2315b92ed62f
font_01_sfnt_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 9832 bytes
SHA-256: 3d2ffd8486a7ec8ac6ee95a732a5bcea470d365d7a7aa801bfb9638a6b46c36c
font_02_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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