Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7373f18cd6ab166…

MALICIOUS

PDF

61.4 KB Created: 2021-09-14 13:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72a11cafb67fb4803df79d2df91083ed SHA-1: a8c109177db01370e065a5ea0453ac89c5663300 SHA-256: d7373f18cd6ab16611ca1018de172148617fe4c42806d4c9f7fe255ef613659a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5125

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://pphjako.pl/userfiles/file/livurujogatu.pdf In PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909015339626352.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/mewesenozozuluwelujisano.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/lekenapududuwika.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f25b0043e0dcdb91b34c2a1471fcfff1/fesozurege.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/33310700191.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/56484854756.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/11131406223.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/wisetawojon.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/jujizakakorep.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/1811292190.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe99181d7---tedolodewilap.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/44399038264.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903195354.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_134205.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b6b2ebd1---fazegapivo.pdfIn PDF document text
    • http://gotween.com/userfiles/file///jaxol.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/dexugeketakagapozamebid.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/sowitekelakupatesopaveso.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613506a85930a---85365894267.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c4327b0---kusumekopidofajuw.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/xuzufiwojogoxoleg.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kalipusomesirewiwirewaze.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/795427f4f7bd22270e7a134972c4ac77/livefuxose.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/jetigobexirizesi.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/garokanemadopumusakozazew.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/totoarj4hln98vgp3981lgvkq4/resulaxuzekibelolel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=911+lone+star+season+1+episode+1+full+episodePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1