Malicious PDF — malware analysis report

Static analysis result for SHA-256 f193806f5f311d9c…

MALICIOUS

PDF

99.9 KB Created: 2021-06-30 01:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 93703e0cc85a45364c0764bcafb315b7 SHA-1: e0d06b297e3eb0494f6b2811bf05ac9481df9687 SHA-256: f193806f5f311d9cff0ed7fe35478b3ff9f775f6714ae9cd54c4a71060cf0b92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e01ed5cb1---fukapedegemixuw.pdf In PDF document text
    • https://by-express.com/upfiles/editor/files/tokumosukirakunodiveg.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/93658cb25f22b4723a2309dbc934de8b/bivolejili.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160800139217df---623745291.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fukotenazakiredutozaxe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/23925d9279c04ee588718412e21d079b/bikanaturodadabej.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afdb9a48c---34339058354.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/47664442579.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/90205058451.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f062311d2---88498551348.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160980667d9ec6---muxarimefovutur.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c200237ad72---gosubitegujixivakajumeton.pdfIn PDF document text
    • https://clove7.com/userfiles/file/dabeguvivefazotovum.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/98754092da341531f0d2f1f67f60df33/mosisatuxufojizubiw.pdfIn PDF document text
    • https://aokman-drive.com/d/files/44101252692.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b38637b8---57651645992.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/14473bb6edcc3567ae755bdd4933f254/penowaxetiwekarekamegemut.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee816ff31---92863669701.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961eae3915---zelib.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/52804368453.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786de22266b---ralifimim.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/chgj1tjp7r4oaibdinlimkp5qt/pazamofowamavagu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ridabigopugipoxalosozuw.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/103c57fe2141c937a27385f2136db96b/891336878.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210608132111_1174464030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+gram+positive+and+gram+negative+bacteriaPDF 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_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 17876 bytes
SHA-256: 60ba0317380d90b4e98300ca7688ebe92021bef84da89d29ead7b675f382b81d
font_02_sfnt_off0001687a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687A 11116 bytes
SHA-256: 18a05afae3b694b0f9cbafb8ab25652209afacf8ba4b600f79b1614149f88af6