Malicious PDF — malware analysis report

Static analysis result for SHA-256 da75165b961a0c16…

MALICIOUS

PDF

95.1 KB Created: 2021-07-20 13:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b57ffd8c6cd325db00eed8f4ccacf9c2 SHA-1: 2e2ce9ceb88176a9ea2a5ef20057f4567b4f04b3 SHA-256: da75165b961a0c1620da50ac82449ca7ba8fcc72e72fafed0794fb539fe5acff
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b40dcd104---16151734103.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3b0256c7e7a5c25f29aa8df08a4367c0/gegapupopilimanawavu.pdfIn PDF document text
    • http://ezibra.pl/upload//file/51210233862.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc04c5095f---21757341931.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f48e4af3d81dddf6688ddd7a6d861677/sovukojupupebu.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/wagovak.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/narode.pdfIn PDF document text
    • http://darec.sk/files/files/zeduwulufuxu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3033dcf5f1---42697480080.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6e23b0d---xagirameropijobuma.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72a6d289a---rugixaguremujoxuvebop.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/1630336815.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/risikep.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c26snkslok7hfblhv42bher9v0/jinorupusofameke.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rtjnqci8froe7c6a5vgumt1480/7255738557.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/72844763452.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607869adee06a---xenonugufijixexululoxurug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089628cd70cb---xiviwisirizebopuke.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28a24055f---71186571770.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/tevirewagababuwuzelo.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tqcnlfmiok9t5p56lago2lbhj7/gitadonex.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/66190856197.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/bosikerizakevapazul.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f671d7bf3---25530630766.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d8988dc51f0d0b7fabddb3c39eeb51d8/bojuverikuxesizowiwajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=reese+witherspoon+red+carpetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 18660 bytes
SHA-256: 0dc00474d255147922c35e387df4b7f06962dd3deaff862f553bb9377bb281a4
font_01_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16184 bytes
SHA-256: cc48400eeab634603c3f0db54172ab7ae8c3f7627aeef0274f7b6873aed2f2f7
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 10696 bytes
SHA-256: 3a959926186f82726ecfcd3f28bed544aa5a80c76027532db71cefe0165ed5f0
font_03_sfnt_off00015688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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