Malicious PDF — malware analysis report

Static analysis result for SHA-256 663a80a494cce10f…

MALICIOUS

PDF

61.8 KB Created: 2021-09-11 01:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae3ee41301b3eb649c3c35516f3e9c25 SHA-1: a8431d546ceea176ab6b829d1890e12ad4d59ff7 SHA-256: 663a80a494cce10f76aea0e11e6fb418c9dfd8f6fa2d42cd32cba8302c92a37c
182 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9043

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf9177adb---rujefe.pdf In PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_070014.pdfPDF link annotation
    • http://heryeryesil.com/resimlerfiles/wuwobixikosogajagafumob.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/kugavikikavukodup.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/lufenabinapet.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/4447310184.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/rerilawadasugegigilufuke.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kovokupewebigugora.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/geberamilexabe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613040dfc873d---dotofikinomo.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/48208313145.pdfIn PDF document text
    • http://itena.si/uporabnik/file/15473858993.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/metevadilujepisojegetu.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109042329277106.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/18412170746.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/48314138901.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/repug.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/lizewigaremobubanawejidaf.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/21413979568.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/69146935804.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/renewuwe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c3b4d66670cf1747d34c6231fb9b68ee/dazuvesulokibi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/de37910cc874934e79557a229c7d96dd/31446567780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+battle+cats+hack+full+unlock+all+catsPDF 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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10536 bytes
SHA-256: 042833fdcc4f0fdcd9508e8347e760c7ef2b2e8a6ca64c4475b573530108b7dd

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