Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bd2886ac43b32c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-22 19:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee5835e33f759e6181f77f0e55baabcc SHA-1: 11d7689c1b0289360509c5e9573b292f2c4e507b SHA-256: c5bd2886ac43b32c409530617fd9a1cc812e9182b5799f746437da3dc111883c
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on disposable or compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=android+network+usage+monitor PDF link annotation
    • http://elencostruzioni.it/userfiles/files/bitogoze.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/muliji.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/ziwelanewemi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zuvetadomik.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zosomovolifuje.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/70624557706.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/bazazegulovaxatovopezavu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///14350597043.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vipamedunoxepujokusozim.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/puvepolazuve.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/31622220804.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/moforuselijunipuzemi.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/95095209121.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/51348282834.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6d39ef6b---wimerebowovi.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/geziga.pdfIn PDF document text
    • http://parfumland.sk/upl/zepuraweridujepalijalise.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bcaa932e---64851895544.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/737c6b03ddb6fa527f1f90abff1453b1/32154155911.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/41587237859.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/41325105488.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/leniribusadidakutibeke.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f93c0284f---nefopuposarevukaxu.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/65667927900.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 17728 bytes
SHA-256: d5db28e55d02b4f77060f631dd12d9b0e826c88ebd5a76a651387f73a9b21610
font_01_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 10804 bytes
SHA-256: 769a2e71b04df22d53df5aa913b9de83b6e3e7f753856250edaaf1f9ec02d9d7

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