Malicious PDF — malware analysis report

Static analysis result for SHA-256 9729f1d786232b5a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19f772be0945dcfc6fe53a26ef542c84 SHA-1: d2b23884933e5f9f8b3a4a8cc5cc03d056999ab1 SHA-256: 9729f1d786232b5a32a5cba1f016b022e8c74ef5d0dad5f0de34022e6b228880
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into approving multi-factor authentication prompts or entering one-time codes, a common tactic for credential harvesting. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the MFA lure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc64b466---89629889826.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/88401577548.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/fobodod.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161361d94c570d---fivomenol.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/92912044719.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/90062072957.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109011727351346.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/dadatis.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ca821666c1a05cf700c76efcd5fb057b/manesadukaxidotidejozag.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161315c2a78d2c---saduwisadipa.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_BC91C797BB026DA0.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/63805978259.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/vexefevezazapeto.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/19149994610.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656dfcd6ee---19859231990.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/vofasowawedowe.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/tunojigabemunatulizaxe.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/22618767066.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/zenakejizoxifixirudemaz.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gikexugaxamusutatesojitar.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/32344427122.pdfIn PDF document text
    • http://labotinnghia.com/img/files/64974475911.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/65740025940.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/28848303532.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/nifevul.pdfIn PDF document text
    • http://ailizia.com/userfiles/tabedasopakodisepejufum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=m+tomato+live+apkPDF 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 10192 bytes
SHA-256: 921dd294801e6f8ca9f7297420e01ab4a5267872fb69abd6f0cac464d5d33a4d
font_02_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 18328 bytes
SHA-256: fa26935be5f5ac81ce37785941c9201c6be00e79fc39d4b222869c7d1e9c4d65