Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c1a0e829d53e75…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 10:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f602a9c208f910243f21fc5914fc2def SHA-1: 25ae56847f07836d396744ba2358eb092b014937 SHA-256: 77c1a0e829d53e75f7429c980c8752d8859529cc3446c7fdec46da654f4bbb99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript indicates an intent to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=baked+potato+and+sweet+potato+in+oven PDF link annotation
    • http://wxhsbl.com/ckfinder/userfiles/files/20210924_072701.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/60353547133.pdfIn PDF document text
    • http://mastervin.ru/files/file/4746371136.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/65881988096.pdfIn PDF document text
    • https://birotex.rs/images/files/wusedidokoduxa.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/62489861371.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k001g9ne04b1bicppk44ohruk5/87487037202.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/zoviragosinox.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/10866546987.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/13535116291.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/duvaba.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/xafiji.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/76506029047.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614190ca5ae09---rakojitomefexabepimira.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/dupitovutu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/serigagotepenipozogenedud.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ee2fed387f241a04a799dc881d668d1a/rapumabopigexunowanexaj.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16154254d42c56---nawunoxakalabugisewunip.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/253cc6d13faecf9f76e2b3784450345f/55386243585.pdfIn PDF document text
    • https://moolans.com/uploads/files/58010912948.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/sunisitajaturelawidire.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/lefofalelakisiforiditari.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jesupavugudoxenuze.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/vegubepozaxulejivewewa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2856f37df---4845846077.pdfIn PDF document text
    • 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_off0000b440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB440 15976 bytes
SHA-256: 4dcf78a2224c5ee3315db652c2c87876def5d449c893e92a7066f913cd0c437b
font_01_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 10536 bytes
SHA-256: 30e9da1da2483d6ec1b60b524dc0da9a7d43c6bdf56baff64c080604372e24fb
font_02_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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