Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eccf0b4e756b93…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 21:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bef6c3bcb5e168ed3ff0ce7e8e6276aa SHA-1: e8f4891ac1e60a36e50fbb31da5357d4d9c19c98 SHA-256: b4eccf0b4e756b9347f303d9115f2dad51ecc757ce8a23cd47109e25292cfd48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=an+inspector+calls+questions+and+answers+pdf', likely serve as lures to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://coretry.ru/uplcv?utm_term=an+inspector+calls+questions+and+answers+pdf PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76ad44af3---tilis.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/42615647709.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/76204483174.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/2osnmk4uhuu1g6861cffoa3tgg/lisoxejasoko.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/fikulexexixajuliwasozomew.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/sumixopiripiratu.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/vevomujafatobonuvej.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/43232913937.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/sifuweboxomip.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a192586863d---57645809418.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7em5r6c966chkcb8hen9cusk7t/xudivuzexivof.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/74980531304.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/890a8c600ce0a5098dc65d0f78392955/2536022059.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753d661d04f---55219976356.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe21d58a9ab---51820780120.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fba61e309---35462232576.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/26a4bc6835d9728355f518d57807b825/tudapibuzesesofa.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/43679225608.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26247713613.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d518d7b383---98863745844.pdfIn PDF document text
    • https://areicon.com/images/file/gufekadido.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1111bc60---63837857359.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/52611187169.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/rekebuxiborejem.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/buwazo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b073130083a---tupuwatajokeguvi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e201d02a4---dimifaturafazasutomixot.pdfIn PDF document text
    • 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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 10924 bytes
SHA-256: 437a40d205cfd913cc2593f73b72e66bdbf9dd57c470d24ff1dc4b7712b7847d
font_02_sfnt_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 17076 bytes
SHA-256: 7dbfe5f20be1232a4f016c0cac6a8bfe61567303bd1b2688dc09275f5bae5d7f

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