Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7ba5a1f47df20b…

MALICIOUS

PDF

144.3 KB Created: 2021-07-07 10:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 60c955c8a70559d18fd1aceaaef5f39b SHA-1: a8b274aa16d08d4da85c3b97c308c193654d7fc3 SHA-256: 7a7ba5a1f47df20bdb8720621675ca872f08dc35fcaad8ff1acd6fcd4da49060
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a phishing attempt. It contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting a link farm designed to obscure the final phishing destination. The presence of a 'Microsoft' brand impersonation and urgency lures further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=action+wallpaper+hd.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bigband-ulm.de/userfiles/files/nominenetojo.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b124d905fb---30439563231.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160936cb99e66e---kubamixi.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/36903018957.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8d3v1jm99vilf58q4409sm9jg7/6045470669.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0cb6q41l9c124mcoeg4rkaioc0/2715452588.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/b6e21ff9e17d4c10012a75db2e490b54/58613168365.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bafddf7e3d9---72713319810.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/15fd79ab7dc32191a7b079abc49eb6da/puxafixebidagulobatafe.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/aa56030acdb9b9ed8975ce82ecbab73e/96202065171.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3b071ca3---46462968807.pdfIn PDF document text
    • http://greenbrier101.com/userimages/sifenolizurixut.pdfIn PDF document text
    • http://sushibelovo.ru/files/6152237025.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609144f694e53---16851166681.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd95e86e3---54214771291.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4ed3a500---15273908547.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/66257118060.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1db1bca5f287c2a6ee5dab3868aa3f3b/nopofodirotulinalazuj.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/xusimesugefakubalagepi.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/lomum.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/ribatatekuwu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d2e5b44797e30458df54ada8ea540ee2/35024702751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=action+wallpaper+hdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4C5 10512 bytes
SHA-256: 66780acba074af4c38345f5d9a1f6817dc933e9e3f74bfaa37c732b5e60f69f2
font_02_sfnt_off0001ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECAE 17812 bytes
SHA-256: 9ff4abbbc1fc422b21cc165954f3dcd215540f801aebc3279a55deebd9b76780
font_03_sfnt_off00021b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B3E 16628 bytes
SHA-256: 45380fb9c3273dbff9b58c05d3c376748b6e74be4581952706bc920728196f14

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