Malicious PDF — malware analysis report

Static analysis result for SHA-256 101acbb37000e138…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 20:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8d70c8577a2bbce5c2ec55e64ac47b5 SHA-1: 426584441a9f6626fc02c556399414e08effe098 SHA-256: 101acbb37000e138a3555d9c1847f02b44610b9250062fd9f514b93c1051cab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing or distributing malware. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of numerous links on potentially compromised or disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://teifsepahan.com/files/file/19309613059.pdf In PDF document text
    • https://gopherscopes.com/userfiles/file/29367174798.pdfIn PDF document text
    • https://robodom.si/files_vsebine/kuzerameleduxanim.pdfIn PDF document text
    • http://vodnik48.ru/content/file/31859228647.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/futafururetunatanajo.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/fedezonomoweri.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/280namta4cc9clqbasgk66n05j/91448177870.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/mokuletomo.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/88643690651.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb93cd21d.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/34285506408.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/ginofolebotobon.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/suserojufu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gezolima.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/35912978247.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c226a6c0ec---vafafegesexulek.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/rezelararaset.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/najuzejevarajokabog.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614081f59e797---lakovemuduvodegowukovasog.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/wedapadutejeg.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/mapafurimazomobenarujoziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=voice+dialer+androidPDF 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_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 17348 bytes
SHA-256: 5dd18dec31b889e180cbb005f85f79e0c85e506e5945b15227cee97909c07604
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 10068 bytes
SHA-256: 1dbc581b45807b4072a768a6c03cf4f631765b22e9f4fc4464109415c9ce8bcf