Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ebf01c057917e8…

MALICIOUS

PDF

77.7 KB Created: 2021-06-27 09:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f611ba9318a3b28147b2e55b569041b4 SHA-1: e1a03541478f1a2a97a7268fb24c9565512a6659 SHA-256: 92ebf01c057917e8bbdd94d5b6566cae1853a9ee31637a064eb90ea3a147876d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external links, including one pointing to a compromised WordPress upload directory, strongly suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=lil+peep+piano+chords PDF link annotation
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bumugifelezizexatapido.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38509c7f7---gebajapawezaf.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/jejupanesawura.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/6690775547.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/fuvizujupolezevexamir.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb71a6fffd---jiman.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c982bb2b9---muzenunekudo.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/8300512400.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/welilojevux.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6vdcelkbv00bo5g0oiha322pkj/guzapov.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/fulolusul.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b62607c31262e5f20e527d54627d5072/86506593037.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/32437168951.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64db449ad---56830682327.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1622676013.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/24510535295.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809a989613f---7762845395.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/zevosifoduvawi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f3ed42f75353f11ba65f5ad1426aea46/37098778318.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/15976316533.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69d5e997a---megaxomemive.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d622c65260---tuwepenezo.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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 10468 bytes
SHA-256: 4d37e70e979307985ea6ccb2b57e0616c5f7caed2a96f7dc103ed53359049bee
font_01_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16680 bytes
SHA-256: d512a77f506f0a9cea3ef8acb343e3883325484e10b5f94ad012cc299369d383

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