Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf8c5cfe6785e61…

MALICIOUS

PDF

83.3 KB Created: 2021-07-19 17:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6402567117a32d65d35b744fe76f9904 SHA-1: da7512f93b4422544852544bd0f03183491172a8 SHA-256: 1bf8c5cfe6785e61e24cc8e271851085f8e56f1cb14d9cb5732fd6cf95c4ae28
136 Risk Score

Malware Insights

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

This PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting domains, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure with multiple external URIs supports a phishing or malware distribution attempt. No scripts were extracted, but the primary attack pattern involves luring users to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://szallas-karpatalja.com/upload/roderolixeverarobuvowiner.pdf In PDF document text
    • https://sanipacific.com/attachment/file/77195840347.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/37foe28jur5f8i85bipkuaa7k4/53020146503.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/78097860144.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf986a0185---xepewowami.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j5hmav31rn534d7d4rcqu875f3/sulanum.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fatijisoz.pdfIn PDF document text
    • http://hevolta.com/upload/file/mevizosokedon.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/49909267957.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zebotanenotafizala.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd988145ac---mijemasevefex.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/64132395005.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b05331f80d147a769035c25e6672ff70/19172846553.pdfIn PDF document text
    • http://asfalon.com/__files/file/94964206806.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mnnqvqi9ub53ue36hnmfokkj8r/woditawipelevod.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a60rt3knsns9shjmn1nt84q4i/menudokobiriw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0ddcc456281a7e1ea2d8f85880e7084c/buzidimuvabavoxatutidi.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/tukazabifudopozalos.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d099032774d---vozafexixevemedeba.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aae74c9de7d9ce4ea9c6093cc5a5fac5/fiwabedapefin.pdfIn PDF document text
    • https://digiconelectronics.com/media/lanadasejakuvopam.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/31218187011.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b71983394---rebimazajalikawisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=soda+lime+in+anesthesia+machinePDF 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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 17592 bytes
SHA-256: 5a428ab1094730b44ac227302895a136bacf11fd3ef471ba13f5bda5522d6f7e
font_02_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 10608 bytes
SHA-256: 3ba0e23c21437f7c2c695d78048e3a710410719662a86107c826f5d8aed84806

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