Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9777af794b8fb68…

MALICIOUS

PDF

67.4 KB Created: 2021-09-25 14:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 794f8b16739abca7deb4b347ec8681c3 SHA-1: 2c5ac7ad32cb6ba3b0d010662947184346a26f8e SHA-256: b9777af794b8fb68c85006cf090d1dc613a634dc1fba7c96bc839ffb46dcf1b7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is identified as a phishing lure, likely designed to trick users into clicking links. The document body is heavily obfuscated, but heuristics indicate it's an image-based lure with a click-outward action. Multiple URLs hosted on compromised CMS uploads and disposable domains were extracted, suggesting a campaign to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 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 https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6cdf1b509---jarapawuloretokafakegosos.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613292f11e4db---gogavuxetuxilojegimalo.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/80036356360.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/98744658565.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/69802756306.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kaniloluvunodowusamur.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/gozexokobirajigozesujowu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cn3vat6snqo4o74fblsmh63hbe/86451222983.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/kiforiz.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/felibefagov.pdfIn PDF document text
    • http://eqsport.nl/userfiles/file/83165854318.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/jafulekemikul.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/vemimejaxokelubawot.pdfIn PDF document text
    • https://eklyps.net/images/file/65058173473.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/84972179324.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/19884673588.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161417d4c9cac7---pedegib.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/64906027760.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/zuseranudija.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/finebizawazima.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wakareworeroku.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/67516271828.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/junakoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=phone+dialer+photoPDF 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_off0000aded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 14376 bytes
SHA-256: 753812ff9dc5189abddcba8bda2e5a22597f0e87ae87f4e2121f43132c67a213
font_01_sfnt_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 10324 bytes
SHA-256: dc84b17cbc3353a5c333dd8c65b35cea6e567433ee32197749678bc7925022d8

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