Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e8350081034faa…

MALICIOUS

PDF

76.8 KB Created: 2021-07-30 04:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 899128097b6edae457eeaf515f5f7442 SHA-1: ff4d8f06529a2c8013ef9ad1f8eea0bb0a12379c SHA-256: 32e8350081034faa46c5e4b4ebf38fc733c43f45464883c16519d2ccec48223b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS upload storage. The presence of numerous URLs, including one with a Tubemate YouTube downloader term, suggests a lure to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+tubemate+youtube+downloader+2.4+4+715 PDF link annotation
    • http://lmyc.net/clients/875386/File/kapejijijop.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078497c14f32---sozefodipuvek.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tarisopasapivorarijonu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/67661704628.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6f4ebeb4110625c6fc6721efaeb1f08b/42276615095.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c5752cbc---rovaderubugatirabokinige.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a61b6862e022ec8bf944fda7288e611c/13246715226.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/30783186531.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/giruwonafezob.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/2382289755.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/fezemalanesuneraxotakova.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/98040655270.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/oafcs1qrpnu7b1p9vsvk4bsjaq/63102403019.pdfIn PDF document text
    • https://yuss.it/file/jawemuxuzibivevuw.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/malaxobe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ede04b80---55164668545.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/h1qp1rilfppl8dnfue40p76qog/jasabaduguxuwaje.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/mironopaz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd007d5b36---dixizi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/betojenurudenisunuwe.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/o3bqc2qrbfh9ccekad2439nobg/sadub.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/63917674303.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/tigugipidujagiwuwez.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/caf359f0c2f87c3252cabd2c10c7cd18/nuvitosokewadujopexuk.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_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 17400 bytes
SHA-256: cb083acc6b33d487e164268c96285e2854009b106ec2822576d83d0cb7bebe62
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 10992 bytes
SHA-256: fb2bc39f02be396569f0583b09833c7ab3c6756808e650190d25b2ba3fdd8738
font_02_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 16572 bytes
SHA-256: f9d2edc1019a22fda28647677ee7b6ecc9fb92fe34a5b56303cbd4d521f6e91e