Malicious PDF — malware analysis report

Static analysis result for SHA-256 8820f7d8f1efe758…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 02:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1d56613e9484be258964d587b4f626b SHA-1: 947bb5f81d34707717bd2d07c14db6aa8c427050 SHA-256: 8820f7d8f1efe758261e635cfc335e75f90ce491e0217b67c1f867921a558a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://wastran.ru/uplcv?utm_term=memory+game+android+studio PDF link annotation
    • http://engroupe.ca/aym_image/files/tuvajoxari.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/ninopuwuroxiwanaluf.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/poxuwasejixirivavaxatana.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/muzisilixelef.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/lovusotatogofikanixes.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/59725900379.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/95024912005.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/vekivitomimisuxutus.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161345ffab4e9f---28859542238.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/29158069686.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe9ac05ff---bazatezi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161421f7218a3c---xepaxiwalu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/13413891555.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kitenavi.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lulukiraketanixelufu.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/zebasaf.pdfIn PDF document text
    • https://matratva.in/userfiles/file/13676920343.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/geweja.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/83015980673.pdfIn PDF document text
    • http://husplaza.hu/editor_up/silava.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/13594433837.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/26386523281.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/89268274557.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/zubivoridifokosutopep.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fdc0e8629ba76c419c574263d95bc7b9/263370141.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zogitenewerozubizigoniviw.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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 10752 bytes
SHA-256: dd3568f9736ebca640995b67390ad0864f552bc30800cb5ca3b34b6e7cdd225b
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16980 bytes
SHA-256: 22de4b48fbdbd33336ff1b6b678a6547bf5024e02eccf38b071ed70636fe9cd6
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1