Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43f92c2fdf38184…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 23:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77a7bc04ac26b96ee21e7010ffa8d687 SHA-1: 084df48abdb2fe1f4c56642c3ddc91307c6ef654 SHA-256: a43f92c2fdf38184899559a09332a1717a095de6c053fc20a951d14815ebdafb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, suggesting a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bitite.lv/media/txt/122/file/87102114244.pdf In PDF document text
    • http://coffee33.ru/archive/file/xelemugejilusiwuj.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda558450a---fujafupavufetanu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lekogagonovumibimavib.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/36511511076.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/kemetewetiguzof.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0a14570bf6e96e8fc94e6630bd8175a3/44916061169.pdfIn PDF document text
    • https://inncredel.com/uploads/zexujor.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0f5a0adc---98923619692.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/b7be3531506a4260527261382c493d50/midagepefofageroba.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8o17sqctchbj6s36rtdvp9t1n4/11878559401.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c413841fa29---vaguw.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/las5vf1iutc8hejmir35e44pag/61238184778.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/34403471269.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/guzevamasexupupubeniguti.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ed604107---xovurufatojukuje.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/pesaxat.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c67238275---pateriwaribozevinubu.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pijivajesokuti.pdfIn PDF document text
    • https://badoza.net/userfiles/file/44344300255.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/solusaxasupodapexetew.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/sosapopewasijidovipopen.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/4265554828.pdfIn PDF document text
    • http://recrute.fr/files/files/27740787854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+de+instrucciones+iphone+6+en+espa%C3%B1olPDF 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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 11076 bytes
SHA-256: 7ecafa170218293fd23ab3d531a3579b714654bd7a022d2f2fd5f9152c5f4d98
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 18492 bytes
SHA-256: a6609f0f5dba4def351ba6795d6ef4a89807beef4e0d12ea292d83ea43386a16

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