Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e818d56589370c…

MALICIOUS

PDF

90.9 KB Created: 2021-08-05 05:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45534794e5f7258ccb4d4c13780b198d SHA-1: ba4791d596212ca03e3566abbe6cc9192e914ad5 SHA-256: 78e818d56589370cebaaf61eaa453116b896c30813b19eecff85dfe667f4b79c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to classify this as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cructi.ru/uplcv?utm_term=what+does+c%27est+si+bon+means+in+english PDF link annotation
    • https://cometsecurity.in/admin/userfiles/file/91997471756.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1f044587---pufetibitifanika.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9eba8c324ed8ffb30d68a180d3447b0d/fekurusopozijizofo.pdfIn PDF document text
    • http://effektfilm.de/files/file/rosovuxizivafeviwuzure.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/77315572222.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c1a73cac---biriguwogigap.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d2dcca8fb---5277720690.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jp168elclkmaqhpf81c5u190gu/bejagulofibelevaf.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/48e5a1a7bf955e6655434f5a33817b7b/jusepopukir.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pe4cjhc6hoim4brkuodvlo2um9/87286511288.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bazipujunexebarikadifinu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d865ff3e077---30023224591.pdfIn PDF document text
    • https://masukpt1.com/contents//files/61661013326.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7skpcj6n6q292f5q5k5a8ch8p5/jugeruzefajeka.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/sesaridix.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/422262676.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/60349450042.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/71397356319.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/simupuzerijes.pdfIn PDF document text
    • https://kuepancong.com/contents//files/95799421931.pdfIn PDF document text
    • https://schmitz.cz/res/file/21627396264.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/texuwozaxajipila.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/limunabuwujesapi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65777271931.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_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10884 bytes
SHA-256: afef1347b73d771fb6fff0629b494e8340eab43a419ce073a7e6945c37bd3b90
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 20460 bytes
SHA-256: 990364a35ed8aee08810a88915215d4fb55b2cbac6e59bd1be48eb8e9ec55c51
font_02_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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