Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee17846436f3e112…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 15:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72d7b71940eb22f5fb73a67811320e29 SHA-1: 213591fda4781345d19c5c2d07d16fb37270ce45 SHA-256: ee17846436f3e11291609b05541d0c401d9cf6b218614c15a47ac3e2ae11ad1f
104 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm. Several URLs point to compromised WordPress sites, suggesting a potential distribution or hosting point for malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=audio+evolution+mobile+studio+apk+full PDF link annotation
    • https://soechi.com/userfiles/file/bibaveg.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/lizomekor.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/81049838191.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/xebetotavafimij.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161372abc86117---vorisejoxire.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390fe909b02---8644928157.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/31834875265.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/50074963546.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/nozujafidupenaw.pdfIn PDF document text
    • http://shahgrp.com/uploads/fividivuxalexap.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/59703922614.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/kovonalolotuwisiz.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/46835001109.pdfIn PDF document text
    • http://vaynhe.com/upload/files/40286487652.pdfIn PDF document text
    • http://rococosofa.com/files/files/78886637179.pdfIn PDF document text
    • http://innotack.com/userfiles/file/pazanovavakesa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135d55ebaf9d---nimenowaravig.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/jirawinanogarupapowevonif.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e690810e9---89315653473.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/98060345436.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/misogasadozitakegi.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/25967465316.pdfIn PDF document text
    • https://olterus.net/contents/files/45065672035.pdfIn PDF document text
    • http://kant21.com/userData/board/file/numusodesivanit.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10936 bytes
SHA-256: a83088508427b46fd4426b81f7c09f96d6faed49319204b5ac6e6c5f2001cf7c
font_02_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 17676 bytes
SHA-256: c6279a6701b15f53081660727260d1dee4662fa04769cdeb248bcd1aa595e51e

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