Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c8fa50f4e46109…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fd6b3c5bce124d52d18e652469e57b29 SHA-1: da040305439a56bc05124b5316d72477ce201e84 SHA-256: 86c8fa50f4e461094b14d013dc0c74e5ea4cd1cf7fafcae300e3ce667a8b771b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df84f773d1b---dolasidolegot.pdf In PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f2f67bf0b1bfff8516e7777bac2ec0f/pelolufagulibokexobu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/20uql9ibrvj0jspq44qbumrmhb/sabapunejuwenawosejolage.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/60745371116.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a4d533bb---vatemuporadevon.pdfIn PDF document text
    • http://change-sexy.com/files/files/96025977335.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3soj0vcf904l8uud6d58kora42/4878574983.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/ranubasodujabinewepenitov.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204f4d3430---79646701604.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2b492f79edfa054f30a1b4a6ffcf712d/revatid.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ced956cf---vadilipodor.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/tejuxadilek.pdfIn PDF document text
    • http://canvangdientu.com/images/file/22367446573.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fimesaruw.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/1188609769.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/80980616096.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cebc4bec8bc2438afd4b80becf9693d6/nexefefabalapigemus.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/sutosesuvunodisiza.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3033c808---15460211424.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/87fvi9hl4v8gh8466jsoav90c4/43064077794.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/xugerigejutosob.pdfIn PDF document text
    • http://texmet.pl/userimages/file/96704209432.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3908d03c---28070701852.pdfIn PDF document text
    • http://web68s.com/upload/files/87945098928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=complete+chemistry+for+cambridge+igcse+second+editionPDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 17896 bytes
SHA-256: b73bc3477ba32e75d64cc2c726a360fcd537f0622ac0717cbaf26219d7d072e4
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 11352 bytes
SHA-256: a839a9b526ed84c9c756747b111fd98906b133e82e07fd412d8fd4cf3e400f56

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