Malicious PDF — malware analysis report

Static analysis result for SHA-256 719a6d938dd80241…

MALICIOUS

PDF

83.6 KB Created: 2021-08-11 10:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba63de354da1b0a1b58ed58ea3ba581f SHA-1: 4d51ea4f59460f4d7856327710880c2c29513970 SHA-256: 719a6d938dd802410aa9ffa512b869d1e998768abf169f24aeaffcedd4aece51
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous external links and the ClamAV detection as a 'Phishing.Trojan' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed810c13---mobudobod.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/ruvubonosewagira.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/gelelejubiregir.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ecb9993c1---37540853533.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/fafutidegiwutafege.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/cc236bc127777aec60b49d69263d7ce0/jesanimerazujipowikunuj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e6f84f50b3daebe55096e23a4a3e1e68/34685471201.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/vesalufodasizegurazitu.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zosofasawovat.pdfIn PDF document text
    • http://ahchala.com/img/file/mozovutirok.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/wulesetokop.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210706_17E4D4F2D7C1280F.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/1200056371.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094470456778---fafizepefisiguruwusugigu.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5241905141.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/voturopux.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/denusopofego.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/90281983050.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088458487547---74339610126.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/xudizisupama.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/44922370000.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/65358444762.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31a8gakclff7vrkj8lqh11amu7/61813382689.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/2394609441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+battle+royale+3d+mod+apk+android+1PDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 11044 bytes
SHA-256: 04d6c1c1ab68c8a1d6bf04ec615e8951a8dd969da3d808319c0ec80e7842f42b
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 20636 bytes
SHA-256: 9e472d28791f67d77b4c6835c2f8b999649843f7b2910844992605b6fe6b1eb0
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1