Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe182e19094a6d30…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b603d909b60403c8c0aaeb11b9040e2f SHA-1: 277d7c681e12f4229630822aacdd693626d5f7d3 SHA-256: fe182e19094a6d30e16c4e0d88cd1278d2ed4e9c24a0937c56be9308e896217e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links strongly indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://rehahomecare.com/upload/editor/files/46314216865.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dei5neoddrmkmhrik6gj5hj2uj/bizofetavijibugowa.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fdadb2364af449ee0c81b2b7df101a58/32729548996.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/69610cd29dbfeabb80fcf7e64cbb27b8/11439128911.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67d5b5bcc---jitalabe.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/jufijowuruxi.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/muduxuvipowora.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b2473c033ee8446da55a021507586979/tileniforovolezesidibax.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/48310879921.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/45582662923.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/velirasuxasopavarapexi.pdfIn PDF document text
    • http://it-hair.com/userfiles/44420140871.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16119922994dbc---nexadikazegoxowidokuvuti.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/33154997490.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/babumagolokulobuda.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/040656433730.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4f1aae4d7fb0457201e1d73efe0c172d/sikusexerigemirub.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03416c7ac---watafazoxob.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/lovapute.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af70852ed---modizawibebefurobuzalod.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bd2536563---77566305109.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/58850423668.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/monozatexuluxerorewe.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodeguzatupokujusugizut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=citroen+c5+2008+manual+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_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 17912 bytes
SHA-256: 748338691172e521e4ed3037a20dcff001462803edbb463fa5c0157526c4b4a1
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11328 bytes
SHA-256: 9e43fbdedfdd50b2a090de167343362aa5c0dc8411fe32983f3379d94a6a5629
font_02_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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