Malicious PDF — malware analysis report

Static analysis result for SHA-256 21804a940d8e18db…

MALICIOUS

PDF

150.9 KB Created: 2021-06-28 08:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5438f01b1c33f659cbf2dc51bb1a287c SHA-1: 6481fb453ea6e8da431be1871d465b4dab82485c SHA-256: 21804a940d8e18db32c728bc7ab53be420abe3ed28ef424be9ffbe92c17ba480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c09d35f1---saralebibutikorajudiluto.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5d1478f96d5c7df7c7a2c6cda3bc3c7/gemeg.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/pqnavdri7546smsmehu8coit8q/78810319902.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/51072329871.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dbcccfbf7---69652948701.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210618_230817.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9402be03---97786795974.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/678ee863652099a4d2e99eda6fddf268/xubexana.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/rakenogoxorogopim.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/fitipezosewasenenabulefi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ef7eda8---50449815587.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f1a490d79c13c153f95d8377ad2a208a/pulakozezodufogawizik.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/84986837898.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/nozadugezasaxulurewadelu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///dabumasirivafazumused.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/45607861909.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/97860938324.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d5e90b6c---miwodavofifagira.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002dad2b77---46180830997.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qpl88h85el2tn99va94sjbq6oo/10173387880.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/kelavitig.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zuwutajo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ib854q0ra5me9bu1lfo67g0971/toxanafopowifejogujam.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105190142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kurose+and+ross+computer+networking+pdfPDF 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_off0001b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F3 22920 bytes
SHA-256: 9a53d00ad0d848820e81d3259452b46c23aa565d7c01bfc1915563c0200d117c
font_01_sfnt_off0001eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB5F 15144 bytes
SHA-256: 8df4d9fe85442c1327ce981d0a81edab0f23fb03d716f870dfd363b723ab84f8
font_02_sfnt_off00021892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21892 11188 bytes
SHA-256: 2aea8fdef50afa0d5584c72e8693904d74ebebd92c163ad82d2ae9380c388945
font_03_sfnt_off000232a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1