Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5d66c1cad50cb9…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 12:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60e2d3990b8c6dc9041c4da438c588cb SHA-1: dc644f88b55d58317433bbbc262a4370c88d9e35 SHA-256: da5d66c1cad50cb99d6034054ee4763a922b19b704cd39f15c7f51dc9020bc93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links are designed to obscure the final destination and potentially lead users to malicious content. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to disguise the true nature of the document through indirect redirection.

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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c912545c7c---14360778094.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160798be4e781d---wujamerujoligoxatava.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b9953d17709---lotemubutepetu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96dd3a446---11567113241.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4b750e66---mudemewadapelimurolew.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/88238580774fb6c2a03411eee037c01b/vosenozimomevigelix.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e24937958---62629440862.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/83e9df41629d89f540db2c52dc8be311/99987215425.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c31c4b6a---69939429301.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210511053135745646368.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5fbdc256357774d5b7ae1a7772b2c532/49946423075.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/rakakuxiba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77434855841.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d96daf189d14c69bbc8a3e93f11c9324/69154363004.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/n7ism2bnjd750o0rktemfac91u/46672363946.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3310fd530c49ce3d175f154fd42aaadc/vavadomipowulojete.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/70908650254.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/37739122609.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/kezotuderirumazimome.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7n4120t6o6bkkk2a24qffgib44/13021905608.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2676bc7dd383e778d6267138dd9654ea/suwepabavadete.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f96fc3541225a5d64e6513ed44e05a8c/batoposiganilesidono.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a25e8a296---10530214171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=two+words+ten+letters+meaningPDF 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_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 10640 bytes
SHA-256: 4663532a6c375ec202adf8aeac6eba88ef9cdf6fde999bd705780792a7e77b6c
font_01_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 17672 bytes
SHA-256: e3a30a74a084d5a31ca02d38930cacfe4ea3cd73988346b1e92d7d6c38dd8b7a