Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fee74ec203f65f6…

MALICIOUS

PDF

90.6 KB Created: 2021-09-05 10:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39e59b41e059e2fa2322c4766ffce5e8 SHA-1: 817013c0912adc4589f6f7f7b742a5cfc52ae632 SHA-256: 2fee74ec203f65f6b83df1209fba0a788cbedf3f39b09b370bd565b647f3d9af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, suggesting a phishing or social engineering attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious payload, likely disguised as a PDF reader application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lraaaeriuk19h37qu5gh0ifjg3/xuvidudalinepigipejo.pdf In PDF document text
    • http://sgrappresentanze.eu/userfiles/files/43765582573.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0cba008fb6455d71494fc330c167a300/9532360819.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1e5cb30880201fa10474a6a8b955149/67563803041.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/dukoduxegogovaxor.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/bopowisitakigo.pdfIn PDF document text
    • http://mastervin.ru/files/file/14930836126.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tifoxosimadisoneveveteb.pdfIn PDF document text
    • http://packamate.com/userfiles/biporezegametafirawezowod.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff802fa47---82406193295.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/gukadero.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/a9kff62mkqtum0e55aq28tadr2/96401329780.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/xiwemave.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/26345682300.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/sodukomejeruligogixade.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/98887543017.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/lutapofefujizadin.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/5910060810.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7821e2becf---witaguvezotakizob.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rigizisorefaxefa.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/32200313182.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6140d78e4b---20127056655.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tegubixugixilijabakimadog.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/sisirobowugovamabuwutejub.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/081cad97893824e9b1937fe15d7a9040/82339799759.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hplinnm7agj5f1hf0n3j4i61l4/72560704678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pdf+book+reader+app+ipadPDF 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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10308 bytes
SHA-256: 3ac8d5906716d90553b3405eac51609467276839a2e037dad8c01b9ec076d3f3
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 19644 bytes
SHA-256: 6876e69a780cdb32637dc2a65fdf70c51717ab25cfe66803fb2b441f5e1dc0ab
font_02_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000144cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59