Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab580a40f3514793…

MALICIOUS

PDF

110.6 KB Created: 2021-09-01 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97c6830fe2969dfc267677b76440f8f9 SHA-1: a2329319b04661868332107a15ffe16b3116cbc5 SHA-256: ab580a40f35147933475795c4d7cf62fa127978ab84b76025c6a55f39599017e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5da4d219---jivipeluribipe.pdf In PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/tukezogelup.pdfIn PDF document text
    • http://promador.pl/userfiles/file/mategaroritemumawizumosaw.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/94985107773.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f373f100e---46121551971.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/74ed142e826c211cbb9498fc97057ce6/68057794323.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/65adfc1e45f1eeab87821ca9490930e9/466569926.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/wokugomiv.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c863c8ce6a368ba31207323b8f6ced3c/tijebizafokepet.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mjovgv4uunv4lm1cfk72v3t1pm/62909039494.pdfIn PDF document text
    • https://longhoang.vn/upload/files/68813011894.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/47080896822.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baeffdf13b---loputisavo.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vanq67v5a1nkaaqbbg7b5kgv62/gobutumazefig.pdfIn PDF document text
    • http://alkanboya.com/files/file///95506054534.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/refevivakudadisaw.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/7245382223.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/41991613832.pdfIn PDF document text
    • http://blgjad.com/upload/files/44685108031.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jmfvpp543nmg9opo7rg5s5u1kd/79898793234.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/34078476915.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754a1266aa---21090092255.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/53478509694.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceacc412fb---14420342611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=patriarch+kirill+of+moscowPDF 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_off00014289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9B 21704 bytes
SHA-256: 529a40c2d6a57b9265aaa8bdd5ad300150ec3fe615e7963fddfd0582e1dc6de2
font_02_sfnt_off0001937d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1937D 10544 bytes
SHA-256: c732cfdc020d13ad302761b39cd349c3da53e335d4d5032c54cc76efac9fa444

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