Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7045ca65d031f6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 372fa16b838a49fb5d669d8ccefcf787 SHA-1: c2543622e6417017496a51f2c4b79e40005dd4ee SHA-256: bb7045ca65d031f6d2de050d92a30d326eed94d24a14e5977ef550f087266aa0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://shinaval.ru/userfiles/file/sodanaguvotenolodurop.pdf In PDF document text
    • https://maintogelonline2.com/contents/files/robatatifata.pdfIn PDF document text
    • http://slsnn.ru/content/files/lukoribobujuzogimiwux.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111716209687.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/87526792510.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/17247052566.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613704bab0f7d---9972215156.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/kelunijawuxufemiv.pdfIn PDF document text
    • https://baglab.pl/galeria/file/maboxilefutubaburumej.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/17135365382.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ed61f7d3472ca83076e5e4c60bf2c20/33441449570.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/80697782995.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/59993527132.pdfIn PDF document text
    • https://anandalaya.in/resources/file/85977821226.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b114be797---2315941235.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/vurijovezizopobimi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/jotubenasoserosewedop.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/67395862986.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/57470710080.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/namobopefijirasug.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/nirodululedadan.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/54066772447.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/mijuginawijexozejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lovenovels+read+onlinePDF 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_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 10164 bytes
SHA-256: b0be6d74f72161bbc2d9827c8acd57722f9a9fa51e3867f9fab9b41db8a323dc
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 18084 bytes
SHA-256: 87c3030c2041de00b02c663d56ad773301ecc8e08f9a8f167baabf6ba78047ef