Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0d2beaf2505bb…

MALICIOUS

PDF

113.0 KB Created: 2021-07-21 00:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 386865b912e75ccc52560629bd6d0885 SHA-1: 9a711903e30e266c5ed69a76b1bd53e2c3435234 SHA-256: b1c0d2beaf2505bb913af79f129bc13a37b47d6d4718dd4e9fbebbb7cacfe748
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd17fab0e2---24038532700.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3348833f4---notinusazugajizakedati.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b779d92f64---24382719416.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/92258667451.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf50799c4---guleradedopudez.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7aeba10c6---nimiwatalekalafifa.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/39960655624.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/29395124045.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430134354477231.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/27667293377.pdfIn PDF document text
    • http://planbmedia.hufiles/29870457466.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0ff2gu7rmknkf0ldt7e043hvf0/kosokagofuledefebixe.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee298822299---dejaboleti.pdfIn PDF document text
    • http://apcmagon.com/userfiles/misoviso.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b4682662---livifafinowit.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a4d01893ef5dc60211e16be37453b6c6/17400117356.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/12613908342.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4d6bfd09bf69035918f055bca2675418/zuzenapi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0489d5f27---sezuretogodofesozaba.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fec62150---24950300580.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1626801172.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b82c47509---zegem.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vg7retpp4visl0uas10h1jna72/44915438730.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c46467bcf---matapevujegapa.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/70789064631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=right+wing+news+websitesPDF 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_off00015858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001706f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1706F 10232 bytes
SHA-256: 3d60fcefab2eda4f7c37136240377c36655bdd77e66266b93152f722f7bd76b3
font_02_sfnt_off00018762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18762 18136 bytes
SHA-256: a78b37dab05a51e0e017c7cf69373032c9a6effdd9ff3ee5f07b5c59faa2d371