Malicious PDF — malware analysis report

Static analysis result for SHA-256 754b7c22cdcc54ab…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 20:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1abf12cb25df9e0ecb82dbc559ef9fb7 SHA-1: 4ba9c9b95ef6b7a7d58d363532e7f809b5ce03dd SHA-256: 754b7c22cdcc54ab804fd5d422e7209f9d389b9612b94c2b339a94adc9e085e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to potentially compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8c42b17a---pixevunidi.pdf In PDF document text
    • https://minhkygroup.com/luutru/files/bamefekug.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/sepasib.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/85131114900.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/reposukapari.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wasimikonaronan.pdfIn PDF document text
    • http://unityproductions.com/upload/files/sewesefemun.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9f1a63d9cf92830e748468bf33eaba82/kovusu.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/47432862807.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/62905459090.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d83664b5a0---75576349885.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/wexegujigikutobozilixep.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/rorebopizige.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/kinitoxeluzikixolakapu.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/57213846824.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630669512bVQp.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/10281289480.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/2456868611.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/12002095645.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/46825046501.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/voloxerim.pdfIn PDF document text
    • http://envigest.cz/upload/file/salubilozaxorudaxuniju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bus+simulator+ultimate+hack+unlimited+moneyPDF link annotation
    • 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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 19572 bytes
SHA-256: caf7941bd19ceb757aa86ef21a924beee73fdc8e35b1e77b61c285a38a45b524
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 10992 bytes
SHA-256: d17e0db2c1a788027414a9ba9fa5b4a464a8e5d23e8f5d7e9cd16dda5fc7a891
font_02_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1