Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5f5153cc1e3cf9…

MALICIOUS

PDF

94.0 KB Created: 2021-08-02 02:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0601db8a5b9bedf5862abd4b6470c190 SHA-1: 923ca5c45f600630c2b4efb6630a32eccbbd1315 SHA-256: 9a5f5153cc1e3cf928619e73cf7fd2dc7ab2151dc135326ed04f4e621089adc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or utilize WordPress upload vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://laborke.ru/uplcv?utm_term=hacksaw+ridge+tamil+dubbed+movie+download+in+tamilyogi PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf091f6e1---gegukakedupegasum.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/37695504114.pdfIn PDF document text
    • http://allycatering.com/userfiles/92457871715.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/fuladiji.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a2cdad69---56746084126.pdfIn PDF document text
    • http://compsult.net/userfiles/file/fisixalesixedufenisefikud.pdfIn PDF document text
    • https://chp-travel.ir/data/file/ranotesawofiseje.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/fijejafejevufu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a57f3c005---57276533044.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8t8ta9mhvc620kk00md9k9ab3p/35588098142.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75201958173.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/251157279504.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90068145943.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/14860991008.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c6f753160---geduxowasos.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/togaki.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22cd17f5a---vovibogadivubifukola.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449925445b---xejupodojepemabujitijum.pdfIn PDF document text
    • http://come2menorca.com/images/file/xenufipijerinofevulaj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28976946185.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0cb813c2---binafuzalazizakepiwugukap.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b469f713556---joluzupenodenowuturuji.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e23678e6df---86077544320.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/43245111365.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/34412063774.pdfIn PDF document text
    • 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_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 17540 bytes
SHA-256: 60c6b583e641c6c7061c7919280fcf81ec138bf68f7d4e28f0c750bb63bf6cff
font_02_sfnt_off00014df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF3 11304 bytes
SHA-256: ecc1d8f8e27d24bcf1e3144e991b3331b51e4f26c16ecec1b3808643a3e95007

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