Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f70b72b539b026…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 09:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93ce47cb96b0ffd19b1f5fef11e658e7 SHA-1: 3703ded1117c243e477d70558f4a630df0591eac SHA-256: 94f70b72b539b0269aa3aaf568cb704c25a1d2c775521e7e6959c08f352a2f5a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f1fe71a2e1d411932d3a1008107ff69f/28322397552.pdf
    • https://eldorado777.ro/upload/editor/file/78482312165.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210605000708.pdf
    • http://noithattamphuong.com/upload/files/duramiwove.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7ac21fe479d05a065d5a8d09d962cd82/junezenijifazuxap.pdf
    • http://sabaispa.net/userfiles/file/bukagujexuvazanezupam.pdf
    • https://yukkumpulgroup2.com/contents//files/8334119952.pdf
    • http://massimomoroni.it/userfiles/files/wepirezusefalopiwalepi.pdf
    • http://changrung.com/ckfinder/userfiles/files/tugokubumujudupotofapu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/spblfe0h5upv0cuspjmtn5aq2t/49336643687.pdf
    • http://barcabianca.eu/upload/file/resutafifatisimutopot.pdf
    • http://amindoost.ir/images/upload/files/38467733185.pdf
    • https://goldenapp.net/file/49007255831.pdf
    • http://homeopathyhongkong.org/files/fafutidegiwutafege.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7143885d151439d9248d9bdd8b125b4d/36592753788.pdf
    • https://hasekei.jp/userfiles/file/96915694084.pdf
    • http://simonhoirup.dk/userfiles/file/42796311449.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4e3ff196876e1906f757ae8776f7d46/runexovazule.pdf
    • https://clove7.com/userfiles/file/90858781178.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d7fc45e4---25557315031.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ade8f381---21195435660.pdf
    • http://jshtextile.com/UserFiles/file///gefiwefifululivutuzun.pdf
    • https://wfca-czech.cz/temp/userfiles/files/71630920829.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=eucalyptus+planting+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 16792 bytes
font_01_sfnt_off000109c5.bin
d198952d68d8f86c04226cb7698b9f2ac976399a1412a49c5106951b2364adeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10616 bytes
font_02_sfnt_off00012237.bin
1162830b97598065d55fca0ec31df86460ffad44787d71be14e9b788c723e0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 17556 bytes