Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ca31c1d13c41cd…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 17:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 008f0f837e72474c3ab207ee073705da SHA-1: 7606a91fd476f90f48c0fc6ca7e6a357d176bad4 SHA-256: 72ca31c1d13c41cde4c53d95e2c738a05a966d20aad55f2a91d80bf98ff7b31e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm. The document contains numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of a link farm is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=everything+i+never+told+you+ajay+k+pandey+pdf+download PDF link annotation
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cbf423aba---wizorenatad.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/ruriratikujomeju.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/73055610608.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rujamufivut.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/natugixu.pdfIn PDF document text
    • https://btegypt.com/file/35817725619.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bc5bb467514f6d424865b0e25f3dd76d/nabaso.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/15115700519.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147a3814ec34---ziradujuwezefijizuzawage.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/kuzixavapenitu.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/14746880829.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/vitevivarakofofazojaji.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/zegofimejekidixerulat.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/nigukuwejejiwera.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109010516177884.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea0e71a1a8---34088361402.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/86183979279.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/35937223916.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/xesafumupatuviterefep.pdfIn PDF document text
    • https://alkoplast.rs/files/kejav.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/56879290392.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/pesekod.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/dexurepakazuzoge.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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 17240 bytes
SHA-256: 89f377e12680e19ae389bd685f5a3836979a370e3b0f32b56a6a9ccf83d4ba55
font_02_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 11180 bytes
SHA-256: 008d8371a77c95a8ce611cb26c06951e6c3f6d6d7ee79b6a3a0c9ce4352dd2d5