Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcc9ba604b9b8a8…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 773827a3ab2b268ea23c670e2c86e3cd SHA-1: 2f4e704fb218d41ee5084ae1c0508f234bacfbc6 SHA-256: 6fcc9ba604b9b8a8cce29a86c80dbf10ebe1383ead1de192d161526ef3373fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nomylo.ru/uplcv?utm_term=when+am+i+going+to+see+you+in+spanish
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda71ad6be---62913115591.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/27876463309.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839add2535---98202779068.pdf
    • http://boilerservis.ru/uploads/files/23836047886.pdf
    • http://doks-films.com/pcms/content/file/rotumabuliverirepasofup.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ea41d13be6acfe7f218e44e1c52aff85/98551218399.pdf
    • https://businesslife.com/content/files/48791857330.pdf
    • http://s-privod.ru/userfiles/file/kedetuxevusukofe.pdf
    • https://esprimagroup.com/userfiles/file/47222746049.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a449e4c725f---77850988904.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082956873fb9---tunubexinu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7af29798---73731112221.pdf
    • http://bitite.lv/media/txt/122/file/niwubijedozak.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089333942ede---47443913383.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68a27517cda8d6bff3cea455ba9f7ddb/62595759780.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/84857546860a07e0d433b9.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3dbe1426---kepekepifiko.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81570777598.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b9e8b10c258e651398473417d72cf4d1/82526420745.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4047458b6---86334494563.pdf
    • https://llibreriaha.com/img/events/file/kerilebepababozaw.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5e1172c7---47194530652.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f881.bin
27814f3f15222402f1d9fe62ee6e82cbcdb5d11e9c1d3b40e699d556e47e4109
pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 18256 bytes
font_01_sfnt_off000127c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 16792 bytes
font_02_sfnt_off00013fda.bin
5a1c072921d6bd2b03b3f8676ab215a0ff3c9da718e81dfe08f9c1d89f2c29db
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDA 10760 bytes