Malicious PDF — malware analysis report

Static analysis result for SHA-256 832e371f94324b55…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 01:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f3b6857874eb56149e0e45ac24724e09 SHA-1: 6cbc66332c2534f2457bbfb3ffdc4cad68f57df1 SHA-256: 832e371f94324b55808949fddf134e617cbf6a2981c218c35eedea53c2a97f2b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm that directs users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier also flagged this PDF as malicious. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8252

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://wastran.ru/uplcv?utm_term=google+usb+driver+for+android+studio PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d47aa0d45bbae183631edc18d1f5dadd/bezemakaguwanijane.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vajonipevixopomodusikiku.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0d971f6b3f42fcbca654b582ff86aafd/34766866901.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-22/20210922163726753264.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/ziragokuxuke.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/23511966989.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631212445.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nagejikopedetutam.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/lupivedezuwipawinanufi.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/dilamaj.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/71684508724.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210926132007_1318656395.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/topigenafakekorofumivinuz.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/96152186916.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bikawuwazivus.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210927051917.pdfIn PDF document text
    • http://birdwatching.sk/media/file/43424128460.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/62829814427.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jibulimatukejepinodenu.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/80371161451.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470653d7e95---posolaborewowuzevax.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/xalutofadazuvupitulife.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8iv2o8nuroutdtfvt1b1n67vr7/xowamofatepejapofudoxere.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/29955429061.pdfIn 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_off0000b814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 10876 bytes
SHA-256: a300f599a6520bd7115f5c8c556f49df289b365409016bad8f4fddaa65a4ad15
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 18780 bytes
SHA-256: 134b6cac9e2abeb439b29e8b7396751217b7c5547c8b04a7387950ecf6581547
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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