Malicious PDF — malware analysis report

Static analysis result for SHA-256 8544a2d673dd7464…

MALICIOUS

PDF

72.9 KB Created: 2021-08-09 13:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f4cd4892be008f8e72d4d5e2d737213c SHA-1: 76f19dcf4207130c38de7db05d46ca41f8727eb3 SHA-256: 8544a2d673dd7464536829cf3aa72cf5fad1a495cf1df42ac79d93d2ecb4aeed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1e2ca799---23571685520.pdf In PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jexenij.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db6f5859644---pisakiledoremebitijuvub.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/ruzusifugi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b44eb5abf34952fb63033b2f5ff0d081/juzoferasuz.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bcf51f20fb08881e780a61760c78694/82523084136.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/51004349128.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vasevazunobotozotekinezu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085824ae39a0---kegekupasemi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tumetunemulesejosude.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/lonogiwowazamudi.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/semefobadadelud.pdfIn PDF document text
    • http://polkovnik.su/upload/file/31760337362.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/3090154649.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/demizuvegudeluzozo.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/wimusajexazuxizanereleto.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kasivafofafukivegatidag.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc203e268---mojigavejesovititelav.pdfIn PDF document text
    • http://isgsrl.it/images/file/1448115070.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/puregakafinosaditukide.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21a458ab3---romud.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787e70255b1---tinasuruvedagazakeg.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/98132467436.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e579d7729---47169678164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=glencoe+mcgraw+hill+geometry+answersPDF 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_off0000bbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 10916 bytes
SHA-256: 5fe9c970cb18e826ba0fbcb9108e87e29c49b4dd9fe5247863c0d23b0e6aa87f
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 16004 bytes
SHA-256: 7bd236324978384f5e3e83f2e5ce1d0344d157216c58b65eaf72f927b19abdf9
font_02_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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