Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e145090e6bd1187…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 16:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dba9f02411c5dc92c0ac23f87c750e8f SHA-1: 0cf2f199226f3d710c72ff007fee4b1144bba27e SHA-256: 8e145090e6bd1187edda493c8c8c1b156acdac7b461fd1d1b7b95aee585f66a0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lasenikiraxavomovanana.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6kfkj5e7srefbdrrve2cjgp4or/51534425478.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/47972436419.pdfIn PDF document text
    • http://nature-revive.org/files/file/kemawavomotimowusuzokaxa.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1afb7a99fc---dazatibaparaledov.pdfIn PDF document text
    • http://centrons.com/uploaded/file/103397521960b54cae48568.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/fapijif.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/bitixojesasaxewubanebaxa.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7ok4crgkfjaog7d867553q2faq/97844595410.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a2a01bf---latalokasetulexotam.pdfIn PDF document text
    • http://novichiha.ru/pic/file/jamitemitubugavidurotiber.pdfIn PDF document text
    • http://yjccnc.com/upload/files/39113288217.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vulitinufamem.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/c83a2e703b39750e1aa58f39cd7949bd/kitanuxexikewunaror.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61026d8b45---kibes.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/76695136140.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e6na3taju7a4h9d36p55fq7nde/92747212206.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1611f063331022---bugowifogaxiroraxazojaro.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/72fecce4f89d113434af5934b7889c90/96629631578.pdfIn PDF document text
    • http://patroha.hu/file/26853150004.pdfIn PDF document text
    • http://jarosi.hu/files/file/50537267392.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/buvakuvagutofigaxujutofez.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/97418224192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=arm+assembly+language+fundamentals+and+techniques+solutions+pdfPDF 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_off0000c015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 11548 bytes
SHA-256: 1d81c80511ef2e62b455ddad89fe09c6a3136e45d54ea540561f9f3502cbe19e
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16356 bytes
SHA-256: abd78ba53dcd30230b0feb1844fb1f3838cae6aa928d4a2b18c0169ffec67072