Malicious PDF — malware analysis report

Static analysis result for SHA-256 19840449e8a533ec…

MALICIOUS

PDF

78.1 KB Created: 2021-07-31 03:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b62e3e3afefaed158110ce23d92eb068 SHA-1: 9cbb99101a1f9469caf290433da82b0fa48313b7 SHA-256: 19840449e8a533eced98aa6a80136ea35bbe36d5381fca5d51344ed18224dcea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gdumr8lh3r9a9pbttf4idjakq6/begomikorakifevexuw.pdf In PDF document text
    • https://mudraconsultancy.com/uploads/files/pejumuwamajufawebul.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bfecad12---ranoxajebo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/37743814208.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/gafoxexowaniguzape.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856441774ce---35930072883.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a71dc3ec5---wutivarademajupanij.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075db07c0a41---rifanefajazorukig.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/3423777600.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/38917735831.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b51d5c64d---47638010552.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/k0k4cv5iiitj5dcu11qttbmq0q/57881870764.pdfIn PDF document text
    • https://bselink.com/userfiles/file/jemifenujop.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/73499075867.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2977cc0b4e612dbd3dc7ff05fc78e094/fobuxi.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/86815066172.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/poguxokuvuwuronag.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/jafadiziputuj.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4d4d2decb42e8b4872739af9c94dcb4b/42101631969.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/82899836646.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/8gfc01ut8saeps58im3hc30p53/5285111506.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/52906708008.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/gosavijekamolepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=myrtle+beach+arrest+searchPDF 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_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 16904 bytes
SHA-256: 5faacf33b25f9a658b5e7342803ab80567a45ecded887b2151cf0cc01e550040
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10256 bytes
SHA-256: bca9748f9a505d99f3e96ed200babb4725c70cba12737f0eba16776153e9a9e8
font_02_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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