Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c0293e14d10040…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 20:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4eac222fd74ceb2070d8b432bc7fc73 SHA-1: 5c7777b8377a45042f8e0b2121bec7e00186de04 SHA-256: a1c0293e14d10040b63277bd1ac783b6184e72f4024aa7b64419365bf5a7c0b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and numerous links, many of which point to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, and the link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8a175efcfd27ece07ff8db84ba02b3cb/tawosokigadubafup.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b19a18ff6---mijipulezetojevado.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/kubesopuxaw.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/toruzafozafifamako.pdfIn PDF document text
    • https://brs.jo/userfiles/files/zofiwufo.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/63266594518.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jisanikaguwavubabepimelan.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/54968838719.pdfIn PDF document text
    • http://dnepropress.net/files/file/nokafupenadanum.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/67128030834.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/wiwitosulawefiruvaw.pdfIn PDF document text
    • https://agrando.cz/files/file/84598670321.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/46690315811.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/jatotanaxiwasoperud.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/tenadala.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/velomapifavitigi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/rejugurenidixuzegojanise.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/63277003341.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/19051b5e4829898d3499291dfd302277/zevezifaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+vpn+always+onPDF 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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10400 bytes
SHA-256: 37ba1363766bca6673479145b34bd18f4bb51afd5275fbf6043de4560e1e2e77
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 17512 bytes
SHA-256: 7fdb767a1f5a0d14572d40885eebb895d92e1a37ae5d40eee756886c5c53b1bb