Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9409a552928f3e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 07:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77749d18daadb65abc57592a653ff63d SHA-1: dcdce0a0778ea83b68575b0800a0325e4f9a5a0c SHA-256: 9e9409a552928f3ecf457794a5babd66e74a03f6a2bb3738e9bfbcdd4b84e2f2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate documents for various purposes, including malicious ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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.
  • 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=minecraft+apk+file+android PDF link annotation
    • http://webinaris.training/ckfinder/userfiles/publics/files/85950679918.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210919_5080DBA1C1FF38E5.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/97dedc95faad766ed8c02c44a2be3e6f/87757191235.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c8b8fc2965bd91b1611aa1f295e3ba3/64043393280.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kuxamajufulonuzejawanobu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/69439212957.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210917235828.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/18522596238.pdfIn PDF document text
    • http://patroha.hu/file/53117615218.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/misowaf.pdfIn PDF document text
    • http://thedreams.cz/files/jabixevon.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/zidipufanewupijobiro.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/runogajel.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/pepijegepanobo.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210915171555.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/kepalad.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/58302890045.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161466d07c04b9---tudurozotupiw.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/tinubabom.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/37372265464.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/21266641063.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/15882115260.pdfIn PDF document text
    • http://turnyras.lt/Files/file/lonuxirexiw.pdfIn PDF document text
    • http://hzqzg.com/d/files/64920071544.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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 15664 bytes
SHA-256: e9abf6dfa019d79abf9eaec5c030a971e3a488dfe65f83150ea34cf73388728f
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10532 bytes
SHA-256: 35549d0630ecee25cdcc1ca8d5d2c43c553c2d33b7cbc84620958f7eda75864c
font_02_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.