Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f400613f04a2e20…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 13:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a57ba39c838a9d504d22d7f47a46afd SHA-1: c8b5153528be4e227cd2aa4840f9edcf47993667 SHA-256: 5f400613f04a2e2048645e84bab6535b796fe5e4ed811d7f8f5fc907c0a84b09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=which+carrot+is+good+red+or+orange PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65b393e34---10043623326.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vigik.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dba6275e3---giriraxomorafakisobudapox.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/zemito.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/makajelolebusegiz.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/53476244019.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/mafotopemidututuk.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4503f3f5b---fafunujeludivijebufura.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/genafebefabadajoni.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/gepasiwowugelosizeg.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b8e88ff52ebddd27a5472e5f66f6eb82/bojizorelevibafapano.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/39644902851.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b7af95d4360e6f5e7e180f56655bcd72/10931929250.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905194547.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f191107924---65361217172.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1026c1f02---juvasobamituzomamevixi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613625af6363c---63093104460.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916000137534941.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cb6d5ebf9f9d31d459aad8025f576829/gawimubarewotavufo.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/gukat.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/33568796536.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090907505140.pdfIn PDF document text
    • http://panova-art.com/files/file/7883417710.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/31067730149.pdfIn PDF document text
    • https://masukpt1.com/contents/files/fatilolobowatogugimemod.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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10596 bytes
SHA-256: 931e802701915bd4886dc953bb3da94fd3779c94a202c2da5d7d6a854953dd87
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 17916 bytes
SHA-256: 43d8cffade338e834ae0c104c349acd0cfb679e5b8e80a36917a60e4cc33a920

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