Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13e1f5ca481aa22…

MALICIOUS

PDF

65.6 KB Created: 2021-09-30 23:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12cd2e3bb9d318c9d9d6082a9b7f6be3 SHA-1: 5d898810785f1d2d27e6349b3f3221f7296ba6b0 SHA-256: d13e1f5ca481aa22e429f89f8a08ca60b547b39f3d44e2c246efc7e1aeb0eec4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6603

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 https://inwebjor.ru/uplcv?utm_term=an+sd+card+is+required+to+download+android+emulator PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70e43e3cb---23131017396.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/berofamisawosuwiboxini.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452dd5bd1fe---wikafoni.pdfIn PDF document text
    • https://datawire.gr/files/files/95594949353.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/5936878514.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/39787052089.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/99782118716.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60506894768.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/mifuxafazarududutejawonen.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/2001570114.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/97787041993.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/zowevinomupagegatet.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/96427682039.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac1dc26b0---82922881351.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/85541087426.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/ruroxuzopibajuziw.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/raxovuxubiwikif.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/mipajinijul.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/40533761765.pdfIn PDF document text
    • http://starma.pl/files/file/35432582207.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jodidewupir.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133aab5b2550---79924614024.pdfIn 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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 10844 bytes
SHA-256: fc2e7475a4304d23ac600539a91106da6987af65eaf265b2179e5fc09833c16e
font_01_sfnt_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 15784 bytes
SHA-256: 5d219edbd1344f4e8368ec8cf5c587a541086eef4ad17e9fd3c23e372f49f261
font_02_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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