Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53ba1b8d6910fb0…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 19:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 412bad03c406a359261a2920fc517dea SHA-1: 57963a3eaa37f4461cac24c26d9e5f4c5e46298e SHA-256: d53ba1b8d6910fb060fdcabdc603d587c0cdbf68e784df99ea1ac7deaacd93c0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic further suggests the document is designed to trick users into calling a fraudulent phone number, aligning with callback phishing or tech-support scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://b7b.reviewz.eu/app/webroot/files/userfiles/files/5687304153.pdf In PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/lovoro.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tomos.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161328bb2c12b0---xunupenalonetovam.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/totanaxebexa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef55daab60---48498923402.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/sewixujowenifujix.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/dobotosizew.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/19557326670.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wiwixetovofebozukab.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/91290675684.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/vozovimaw.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/16969203608.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ac86ba6d5ec9a0671f59a393e058b486/nizudo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/7969587886.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigubefo.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/tepodulinupekuk.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109081211111754.pdfIn PDF document text
    • http://snft.ro/media/file/gozokomibomiripof.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6f8f43cd34c3e4c93ff2a2f5de88bf4b/jumurizuxinumumisadide.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cui3005fad8qbm0vkl3sqa3957/93662432733.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/94145214490.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/jozeb.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/soneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+projects+for+final+year+computer+engineering+students+with+source+codePDF 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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 17456 bytes
SHA-256: b882b64cba02f849176433b7224b72717c72876a6814022dec0c481d539814a4
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 11476 bytes
SHA-256: f9bfc29af50ae63e2f141610e23c265e4660d7de9042764ce2e9e84afb6e69d3

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