Malicious PDF — malware analysis report

Static analysis result for SHA-256 50647f156e545a65…

MALICIOUS

PDF

92.3 KB Created: 2021-07-04 23:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e306c9e93659ff9f67ad034e20fc0de7 SHA-1: 9d3ed88b3dcfd92f7b4dba42999df4e51fae1ae7 SHA-256: 50647f156e545a653050e47ffa01e2a47c2df629be1282969f1ee2ad3e8a8761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains that appear to be compromised or used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to distribute traffic or for SEO poisoning, rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bu1cb5evvfo4h44pvrcv9dic5t/49663724365.pdf In PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r9fp6q3f96t4c2n91ukv7gait2/loruwezoru.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/netoruded.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/18214180868.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/fabufupoxipiputap.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wetakelobafopofijideg.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088789a5a915---bonitetoxux.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/miuog2ir3m6av4n81djl532mto/60907695981.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b80b7d5a21a70b607d8753d993b01ec4/44214224421.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d5ud9b143a9341bnltdq7eitkb/88213356564.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rfjio49n3jlln3vss9h7f7h7s3/neliwumiporidodurivew.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1f2ff4f683b1eb9dd2ec749c042631fa/pafepiterozutina.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160846fd014f9d---soxomaneru.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/536eafb0f2ed1a5c102bde742cc9e3fd/rupinabijifidaji.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4283c12ec4---57301795611.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/dikabakoruxerijupufed.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4novhr5a4l0ricrjm3f0jc2cn7/vabamukijevixugedoba.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/15355060386.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8c4416ce0f0d0354cc3c62801208384/31601426762.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf79fb80d79---35321842332.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/fedorizad.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pvi1hfb5reuk4kvl98q2f88g4u/84229410410.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080c214aea83---dekowebuxopev.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgu1ghmgn6fd6jhf9pnr0fbng1/finuxawofo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/os0pnlnoc7tfs7n1u55u4e5j5l/lukagimatemezuxoraxifo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7e717817---79589367346.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56da378281---zogukofomop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ielts+general+upgrade+practice+test+2+reading+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_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 17044 bytes
SHA-256: 9acec0cb60567a7ff76ad03807599cf47f08235b11d61bf7ab368d1fdc847661
font_01_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 10828 bytes
SHA-256: ccee5effcd05f19bc8d496d1eb632b3ac8d9b03fe4f454d9fbd1a7e2806d4e6b
font_02_sfnt_off0001497a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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