Malicious PDF — malware analysis report

Static analysis result for SHA-256 4590e65459f6d6a8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 20:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76f6c0a55c98f6ab639b72dfa5102450 SHA-1: dd0eef1bafeefeb7cda48aa3a7f3ca0e11468f9f SHA-256: 4590e65459f6d6a83e500a45019ba576525df915a486d02659f19bae73b5290d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.algeos.com/js/ckfinder/userfiles/files/65609230176.pdf In PDF document text
    • http://gmtshipping.com/attachment/file/gajezogu.pdfIn PDF document text
    • https://laser123.com/geektic/files/72566777522.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/63387107211.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/zuvejor.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/beravarisudoz.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xajolokifuvoxuwisemajemax.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/falur.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347dc3e44bf---sotekoniwijugewenuguv.pdfIn PDF document text
    • https://izometal.net/mm/file/96929249998.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902020417.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/gepopukasulup.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7501490---nubatakujajesumeg.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/60328389036.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/34834971748.pdfIn PDF document text
    • https://zzwgjx.com/d/files/92976117069.pdfIn PDF document text
    • https://n-tlg.com/files/file/46031919820.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/93440260497.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/jezudixilarugoral.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/xokurovimi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70d2c6f62---12836345489.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q4kfcpr7sdq01d4bfksv07o8t0/33424538112.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xarimuxaneke.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/baxewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bosch+automotive+electrics+and+automotive+electronics+pdf+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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 16488 bytes
SHA-256: f1b760a4b7e2bbfe9f4e27332700e339431c4ee65fd88358a7715a799b8bcd34
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 11188 bytes
SHA-256: d449d13b3dd922f13524c58f2ac18ce196ffc0a2552cceddf08ba41a20110aaa
font_02_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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