Malicious PDF — malware analysis report

Static analysis result for SHA-256 15783de2221cafee…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a64371e97410d5176c6a69ddd58c102f SHA-1: d339d5c848961c2d518a44edca7d741f5934aa8e SHA-256: 15783de2221cafee2744af98d923454c67b940c8bbfd15ff50a9ef8c1ef77840
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7a44fc8cf9f0c53015243e29a59ee0c3/81861241117.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce95668cb---66955998869.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8df49b66---50074514541.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/67605989891.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/86322254470.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kowonuza.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sh3m1os4ppha0rofkv2p8gchec/ledavekiv.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d8e06988ece40a0292ef05b948c95dd/92419892555.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf895ab016e---92456567208.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/53ti9h8itpeudq2v01lv29citp/72388152781.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20218181534273136.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/96296014595.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pafiralonepipunukulip.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/70053926574.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/22641a613be7924afe8f45f4b6f0d5ee/99541784878.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62634718779.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90333313405.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624142952.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mafusisimidokawuf.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210728_002630.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/zubezozarifemosuvu.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/bimulutaresuno.pdfIn PDF document text
    • https://actor-conseil.com/files/file/futusipisata.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc540118---juligatafitinenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hal+leonard+tenor+guitar+method+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_off0000baad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAD 16600 bytes
SHA-256: d19e05d86c45f1c7f7b64edc851a900709550318d613a167e91e57064663f8a8
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10868 bytes
SHA-256: 83bec871b41640ca4f12ed7223ae1f901d8bc30ebfd22c2784ddd2b044b4217b