Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ec25690f10457f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 06:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49c50f4a7f66af52b0fa6cffcc593a69 SHA-1: e713a14f817a3baded2d72d3656a1214f4a7c426 SHA-256: 25ec25690f10457f5a90c6e7c28583449e288e613aa3918259df3521261ce550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://phanvienphianam.com/uploads/userfiles/file/towewowu.pdf In PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/meragiwasi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xepiluwifesidujizidixixoj.pdfIn PDF document text
    • http://imaginove.eu/data/Files/wedesofokowiliji.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136037573474---54770833472.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/7337559607.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/54931730004.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/mulolonudikirosi.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/94021630288.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0bc80c10d2f5faf506861758fa241d6c/91406006589.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/31568240202.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/mezulusaz.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6888426e16484325c05970de2a56288e/kilezore.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/lalifoledode.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/16436963266.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/75120729536.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40cc99c7d---zavivivozupakizok.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vizoramojifa.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/tojosikiwefukonatitubure.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/nudalepokotomalotefat.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf6ae36fef---gipodoginufegojuduzofap.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca0216f76---xawajuburipakom.pdfIn PDF document text
    • http://rinsacars.com/files/others/26338848819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+country+is+the+largest+sizePDF 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_off0000b270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB270 10776 bytes
SHA-256: 69772ed44a63843806244302941c5e9c4567bd38beedfb5b0c350f988092976f
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 14784 bytes
SHA-256: c946a1310a78981c7c844440be3de7b012190fa5047bdf5afbd1a61a99ea6c06
font_02_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1