Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c286e404b328cb…

MALICIOUS

PDF

138.5 KB Created: 2021-09-07 05:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13e90c65df851a918df0fb21665319e2 SHA-1: e74f28cb2922732a45d39306b9f63f1705b0bc1e SHA-256: 68c286e404b328cb3116377c315c363dfdecbba6b1a085b398c1fa76a53557cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to obfuscate malicious links or initiate further exploits. The heuristic firings indicate the presence of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • 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 https://aashianarealty.com/file/fuforevapipawuvi.pdf In PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210808_F19612AB8563ADF5.pdfIn PDF document text
    • http://patroha.hu/file/nomabizegosabuz.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16123b61449abe---kifegatemedu.pdfIn PDF document text
    • http://mp-journal.com/media/file/62923189074.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e228462251ea44bfb82168f98a201035/67986037809.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kunezu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/53957628342.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/44724859219.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f7cf529f97c7f0e8cf9747b61cc44e42/3299073143.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160affa1fa115e---xavazot.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/ramasozikofidivomivufeg.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210813_093108.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/79408914311.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cfe85bf5---buvaduzut.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c989253a51---nemoweramewosijo.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/tazunewumi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0ca6a670---fefununizunefaka.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/9656170922.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5seeclbko68avchqoi36dartj6/23400553512.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/xesaxixilivu.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61241a68f291c.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ladisike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=introduction+to+semiconductor+diodes+pdfPDF 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_off0001b622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE39 10624 bytes
SHA-256: d58006b979ff63ef59535c2d96a91c97bf0d663c6e9c28c1380f55ac23a37eeb
font_02_sfnt_off0001e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E67F 19976 bytes
SHA-256: 66c485dd572523f7abf4056d5249516209eb1443602aeb303321cac2e0736f3f

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