Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc3baebe44bcb94…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 09:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54d07b8606c0449590f6dc0a116a831e SHA-1: 4b50b661acd5cafbc70471a69db54285d45808bd SHA-256: bbc3baebe44bcb946dc982279721af4a715bfc8ab4e2a50d95d4ad4712a5ccde
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/212b60918b46567f9159438e40dab28b/49950468347.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/49333879852.pdf
    • http://agriturismolescuderie.eu/userfiles/files/kewamosibu.pdf
    • http://hkalc.com/userfiles/27030233216.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bc4cb752c3c2ec0f958f2eaa2d693f31/61972719268.pdf
    • http://www.anjhimayath.com/upload/file/gaxiganufuwo.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jul8qj2d9o8bm92d8i55nsnkni/lipifubuvarazalaminatuj.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c99e20731f2---xulisonamaxiweja.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kjt78m9iariutnf0s8t6b1ad10/2563995689.pdf
    • http://myshopekerala.com/userfiles/file/nezaxuzunivir.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc9001609---fugunilofor.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099596ebe5b5---jejasugege.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1b50b6f01---sabesew.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c95b8549df92816d347af2787492445b/69950148834.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/c06b32d4bb142966740399b1e93599b3/44512571732.pdf
    • http://maristaslardero.es/userfiles/file/95036938265.pdf
    • http://ca1970.com/clients/10044/File/88383752667.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/21821693034.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb652c3b45---29662246856.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24449b4dd---97906967394.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ae54d7ac---75664875680.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b3a5c825---nanopigafifufotokinufin.pdf
    • http://vladjurnalist.ru/archive/file/2681835503.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfef234512---nofopatejanikisemomen.pdf
    • http://growlink.biz/userfiles/file/bopop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=list+of+words+followed+by+prepositions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ee.bin
c87d4efb432e974842abd184b961e3123eb981993116b490a254150a608d7076
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 16536 bytes
font_01_sfnt_off0001125a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 16792 bytes
font_02_sfnt_off00012a71.bin
0cb15f4b32c2350c4bcaf7c8c1b0d34b8ddbbea52bbcb9c48f2fb44a0b615e62
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 10624 bytes