Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb70e922efa657…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 22:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0c14f0110b573c61919f4547ea1f730 SHA-1: eb6a918d307ee01e589509beb95f995e3858e137 SHA-256: a6fb70e922efa6578f8f8f37442a1aa5c818ec3b556049f11f87e1fda54c070d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm on compromised infrastructure is a common tactic for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161359022b953e---pobuzibamavalo.pdf
    • http://auto-rad.pl/userfiles/file/ruveripi.pdf
    • https://kotypsy.pl/ckfinder/userfiles/files/54547986208.pdf
    • http://yuanhebiotech.com/upload/files/27134781374.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5b2ef5c8a2530ac340bfe75fb227234/gizigosaz.pdf
    • http://xhzhengli.com/upload/pumumuvugapifofumasemisuv.pdf
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/kamikotuwumefapuwaneb.pdf
    • https://laetitiabernard.fr/images/file/godabofiloxeji.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a817ba3180---66997673332.pdf
    • http://brilsports.ro/userfiles/file///12681289648.pdf
    • http://jeyadhurgatemple.com/userfiles/file/sawid.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/sexavemixowenujazanem.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/76c9e8e7c8412ddd0004ff27286ee7db/64987545685.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/52881627191.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/86305374331.pdf
    • http://relaxzenter.com/uploads/files/19644845440.pdf
    • https://aviseco.ro/userfiles/file/pubudasaxasukorivepozafen.pdf
    • http://mathrainbow.com/userfiles/file/74281534989.pdf
    • http://scsytech.com/upload/files/95228542116.pdf
    • http://sissonne.hu/editor_up/53568757350.pdf
    • https://eko-briketes.lv/userfiles/files/fukajozitobaf.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/fagevifurozosuvuxovuvavol.pdf
    • https://perfectprojects.ro/userfiles/file/xolij.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/195b96d8024a368affd79e7c678c6707/nuzuj.pdf
    • http://gddfboiler.com/uploads/files/loduxidojodavu.pdf
    • https://tannhatviet.vn/upload/files/dezexorabevikixirevakomes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mlb+live+stream+vipbox
    • 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_off0000e1d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 16792 bytes
font_01_sfnt_off0000f9ec.bin
1e731f648578f95678ca882e5346949e6edd4f983406e758f3403e4488834021
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10612 bytes
font_02_sfnt_off00011205.bin
34c917db1693e80deea55e074b90e624b3608d20e6bc4de3000855a96ba2a848
pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 17936 bytes