Malicious PDF — malware analysis report

Static analysis result for SHA-256 700e89348611a10b…

MALICIOUS

PDF

76.5 KB Created: 2021-06-28 07:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52236d1d003379efec8822e9dfe4f34d SHA-1: 5190e860ed3b335a897787731e2e2b1287bc2ca9 SHA-256: 700e89348611a10b1373acfeb69d2dc8c9f91d1c84c9456e2f86c510c6f0e1fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kgu7acvg1ch0m968i19lrieu31/jujanibupotitajajimiboni.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fa50f515a84a0335edebf0f6e3f30d73/mujexezavu.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/49647311049.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/86f5b44f69bfc1c392ef016cec53c1e5/sukurejig.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1337a83297fe78d8851b2b164d87fee0/muxifawefijeji.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hlvm9ooolknao4gfa9qbg77je7/89285685831.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad216d6907---gujugoterugasotivageti.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/10589777550.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e04f30a8c---76898704813.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/kaxakagisetoxi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2bcdhnr85nucvg9j81t8p5bgv0/renenibenu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b08ea79d3---16732927418.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214ec42f88---zagovedasigumerobiripos.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76bb31071fb9b0b07202f64fc8ba1b13/28985883136.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d95a49b33---72609246613.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/jagepebawarelopuduw.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nupop.pdfIn PDF document text
    • https://tavio.ru/files/file/42469175685.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac8acadab---32708585187.pdfIn PDF document text
    • http://cmtsport.com/pliki/tegazosa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/bixojigedexop.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ragozubupaxapuzugisut.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/rewixa.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/laxidikoratutovajawelu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dtelctiu1bvpgripjpeavj72g9/wivaxalubosulugasufizi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083532b6b15d---vobijulevawago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=deep+in+the+valley+unratedPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/77033896542.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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 17004 bytes
SHA-256: 895b0496e1fb49a6aaec1b190fdfe20e65e88ee99075a5f68da0cfe9cba49c4d
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 10484 bytes
SHA-256: 02fd17f495af84540fb41921729978d83947b2ebf3b14a287b9abb9915c70d98