Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d53cfd44fc4f6b9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 06:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d61ddc7a1d66476b29ce78868be51b9 SHA-1: 6aa09b29a4779f68177d5f51f46da955d61a1a6a SHA-256: 6d53cfd44fc4f6b938385edd4477bf955b3aba98210848bcf491d4c67704c3e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is likely responsible for redirecting the user to a link farm. Several of these links point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1da397a2---loxanigero.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ueidbki4rqmf4nnv4vvcihtvjd/wizuzevabomipedaxivez.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/63894748149.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/rijod.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/642723d8339424d9e7a34370fd2612c1/tujibinilako.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff78c67ec3---90479416692.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/golufes.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/siziridipi.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/fogowurope.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/77532707592.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/fozifizexi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/10220640027.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/nedusapulisimuporo.pdfIn PDF document text
    • http://tipiland.net/upload/file/7823449635.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/xokisefefeleje.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nezafumud.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wutana.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/44523138554.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/vadebotunesajudinovojawi.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/44247212862.pdfIn PDF document text
    • https://tigaintan.com/contents/files/faboz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca825670f5bae6cc6f12de35e1429ae7/39100616403.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/momakadimowomej.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sotod.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/54801968806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=new+punjabi+song+2018+mp3+downloadPDF 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_off0000b9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 15696 bytes
SHA-256: ee02f273e6bd3dc02d3f40622c5ebdc2371cb14e0b69c382bf22a8c91c50d787
font_02_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 11644 bytes
SHA-256: 6088b66bedb1e64c0226aac7387b8f4cfe91d4e0180c43931c10275df1a39b5c

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