Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5d0890f2be14f9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 23:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b68a6066fa382ee970013a98e2a76562 SHA-1: cc24e870206467225bbf8f9ccd47c5984994a5ac SHA-256: 1c5d0890f2be14f9bca86aac6d64e8854e004b0ec99e578ccd48e79931024604
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites. This suggests the document is being used as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a phishing or content distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770846c724d---tutenokuzaken.pdf In PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/pitekubafodiv.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/jinakozaturi.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/bokasujesa.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/55991237684.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609952e10b720---lidedov.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f02f5cec5adfac2d11157f6d62fde1aa/zinamiwaguluwivixub.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k78j1ujaihc40sneosbblpu3g5/ripokotudomazavupa.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/japoj.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210529222311101.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nedomuwovotukim.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607604261fbd9---9527379027.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6bd7369e---romewetafoteludexotofun.pdfIn PDF document text
    • https://tepihtrava.rs//files/gixazaxugalufaxuzisomo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090930ae4695---696166510.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/boxutureru.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/333ad2e95a75f16baac7221b1a735fad/94519912563.pdfIn PDF document text
    • http://byecook.com/ckupload/files/9723143157.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/popilisoxilotejodu.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107281716024674.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/papugisobufibazosipibum.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/uoo95l6820crde401j5rl5ue44/213599649.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kegod.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/rabebeg.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/84591796120.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210803_A751384FDE8AF07C.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/97190140473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what%27s+better+intermittent+fasting+or+ketoPDF 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_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 15496 bytes
SHA-256: e41867d96bc000c10cf03f32d605fd96bf149f3e5eb32477e9f4f59b7fe67e23
font_02_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 10876 bytes
SHA-256: 8d160b5325a41f4d72f3b428c71c6c140b974aa787941c43f67e0b56775002cd

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