Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aa86c1bf0d2c18…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 06:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7575e699051c4cb97147c1faeaf3ad33 SHA-1: a4149042289dae37655381decbd04cda10e07504 SHA-256: 87aa86c1bf0d2c189a045b2a062a4de0aa1359e192c028ee89858aee91f636d2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to various URLs, some hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document's structure, with a single image and minimal text, strongly indicates it's designed to trick users into clicking through to an external site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gocreate.termall.pl/upload/fck/file/wixefotin.pdf In PDF document text
    • http://sicilyontable.it/userfiles/files/58886530422.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/78025472347.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7sa7u5pv0g9cfo7joh1b4aor0h/27178362883.pdfIn PDF document text
    • http://leanuslab.com/UserFiles/file/51608208719.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8009a17fe7df9e4b2b9449c52f617562/91917533072.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/pibebiwig.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97e04de1720d7de0d2b2d1c2d0eef122/timosibuxi.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/87638326378.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/tefawapimi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39993804148.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/69925791126.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/44801458135.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/22506760595.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/73260052393.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/94847613494.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/wunagirirudunanibowesip.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/21967057034.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/366443abd077dd35d65b2b94f12c055a/58184649621.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/siwoj.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/40552543194.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/49466536468.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/14503883995.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/budibulonakuwunewofu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0c4cb3b88829c7828e6a6b9adafda7b2/41941729964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=arabic+go+keyboardPDF 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_off0000b0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 14756 bytes
SHA-256: 19905ab7ec20d0a9b404e692d7ee7786bbea6af0613877f35c88793d9c54cbac
font_02_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 10456 bytes
SHA-256: 55868d788142768b1883a233f1d63e857ab578ffa351f6c1b4882c07ec954b0f