Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d5319625ef5dd0…

MALICIOUS

PDF

149.7 KB Created: 2021-09-10 22:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0de84aa118701212a80f852d8e1b384d SHA-1: a8dd579e00b97644abe7d2477ae58420a8a4a1ef SHA-256: 88d5319625ef5dd0d0e9de89d7c1b4b5f2556302629fe08760be31b35824e280
204 Risk Score

Malware Insights

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

The sample is a malicious PDF that contains embedded JavaScript and a high density of external links. These links point to various domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://smidgel.ru/uplcv?utm_term=principles+of+corporate+finance+13th+edition+solutions+manual+pdf+free PDF link annotation
    • http://karinameal.ru/imgdish/files/rixir.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/supofosodaliv.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/95958185456.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e884c46b---99436386564.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/60020415433.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/dilunapegupizo.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/52657148335.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/vavugeloletefofekisadesop.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e243a045b0c062608141826adc585732/10472729994.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/jekazijimasozed.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906164813.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/32887678023.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/gegasowamakot.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gukobogakalebige.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/volakewagujiwo.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/3825491204.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sinitupotafuvexajaf.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/80f9ba9965780c76e6e8620e5141404c/lovoputesareferitenubala.pdfIn PDF document text
    • http://cke.hk/userfiles/piropugelulifujovud.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rafoberorir.pdfIn PDF document text
    • https://sadex.pl/fck/file/sobuladawov.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/69112369832.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/wajovu.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_off0001d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F118 22996 bytes
SHA-256: c289c7aa05b6b1d3e2682966ed7a916a28bb6255b0bcb4894983147b0e325b4d
font_02_sfnt_off00022e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E2F 11208 bytes
SHA-256: a81abcf571d976cf82578e2aa9fe7eb1ce1c30e16537418f15876c6f6188bed3

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