Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c019b40b9df75a…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 19:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e49896a1289591b7d74a995da6224cea SHA-1: 5f83d06279b565f5ab2f6dd646d1bffe90462741 SHA-256: 07c019b40b9df75a53230926d35c23c8a42934cc4886a9efbfda2967ca9e4f04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that act as a link farm, redirecting users to potentially malicious sites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=can+i+run+android+apps+on+windows+10 PDF link annotation
    • https://ateliersmq.com/pevron/www/img/file/32264437487.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/zikumofefumisividexagi.pdfIn PDF document text
    • https://hirurgija.me/files/46412912913.pdfIn PDF document text
    • https://o-dance.com/upload/files/kusiwuki.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/xerupomagafasuzomi.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/jimofexugakizo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d83b5d6d---ravuwibuzojonubinotoneti.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/77485493114.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac86e5b3ea---welesapijiwuzugivewitebu.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/53793384521.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/12121185331.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912204916.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58156965067.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/dajamulexawoxudij.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/75681392597.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/15194270171.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/36813609420.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/bevex.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/37455976568.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425379a3733---49254740239.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/buzedupof.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/dasisatatemowe.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/penopidebovevuvonipevejo.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/1964181933.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_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 10500 bytes
SHA-256: cd4bffb4121e8d182e2e4b9172a04042874d0481055f38633f00e9630cffef21
font_01_sfnt_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 16884 bytes
SHA-256: 011a008540fd6078751de1da81f9c3905c72c0a499d0b169fb2c33d73c32e5b2