Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cb80c139606c55…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 12:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a1af48babe486aa36a0d2631e889c34 SHA-1: 130e95637f310a6e877a78babcdbcc31fc04da12 SHA-256: b5cb80c139606c556ab4573ffba32f0ad774770b95b3e08f20b86e078671ec58
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm to distribute potentially malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=weed+firm+apk+download PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/14708436653.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/195d2a3ed64c9ea7fd7ab4bf8f1d2641/66666796127.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pivapanexuri.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/sekikoxedapixakagaxitul.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/luwevas.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8a54d0d8---89062683603.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/31569894586.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457dc2a6df0---49973955057.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/67608786873.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/lamel.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/wamelitakomakuganonako.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/juwakev.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ae232849c56c9b9202fc8b7921b63fe3/dikupulesedewedek.pdfIn PDF document text
    • https://oferta.lt/i/File/90348426281.pdfIn PDF document text
    • http://tcihk.com/userfiles/61550092120.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f886aba818---23202555180.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146475d9fc14---pasovapedexetepakodixu.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/43770394170.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/27383212640.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/vekoxefemomolosejosivefa.pdfIn PDF document text
    • http://toonesk.com/upload/keguradatuduso.pdfIn PDF document text
    • http://tencanpowder.com/d/files/36520409477.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/82107276000.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 18124 bytes
SHA-256: 817504969cdbfb654371f5a56d0b1a63026ee36f7f5488bb33caad95987e5868
font_02_sfnt_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 10564 bytes
SHA-256: 355ec980f3b2a5a385ab68a114b7de592ed114528e012eaa386abcd2d50b465e