Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e9169666e56785…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 01:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b76697b21fcb3ddb8988acbbe3aa21f0 SHA-1: 3140c62c1ea6dfee4f6945b1732dcb6c3e19b3be SHA-256: e1e9169666e5678571a6189aeeea609f2a1afde14e5963d6196a19d24bf06e76
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and the nature of the URLs strongly suggest it's intended as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4593

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=a+word+that+starts+with+n+to+describe+someone PDF link annotation
    • http://viprealestatebrokers.com/userfiles/files/suwaduxalilepobebanaj.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/26686460310.pdfIn PDF document text
    • https://kueapem.com/contents/files/zidubutudij.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/jexibiluk.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/diruzifatamixik.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/63190319339.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b05103eb7651166c07ea1f7beb17af0d/zezasedolezifa.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/86818146702.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/91417352992.pdfIn PDF document text
    • http://1careglobal.com/upload/files/70275128525.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bikixe.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/zedepepeg.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/dotesetawuzonuxiguxa.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/18712930755.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xejafebazazotur.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/96094305763.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/26867188917.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/60975163338.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/rajakefiref.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mio13s83cnmvnilfqiur7pgofq/banikitapugevuvetuma.pdfIn PDF document text
    • http://furniture83.com/upload/files/tazodekiviw.pdfIn PDF document text
    • http://minerva-collection.net/files/files/82121428208.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9459ce8a1---dimubegixamalipoz.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/68888772918.pdfIn 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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10796 bytes
SHA-256: 2101558633ed323a398537172f91ad514eeaeae099904f81b571bed1a37d9250
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 18384 bytes
SHA-256: 7c44b35b509f47007a3d1fac44b686331b8b83f90556a20fe8d0f5661706edde