Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fa4b407d498708…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 00:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7bb9699a84f625af3729250036705eea SHA-1: e0b45d7f26d3791ea7cec715be8e0126ffe8618a SHA-256: 19fa4b407d4987084aced5c35cf00a2ff5dad7298879037277db3c822f9aa38d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to potentially compromised WordPress sites and disposable hosting, indicating it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://sl-light.ru/design/img/upload/file/43443272434.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a508d63d---gesilelexo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098717b0dc1c---voberik.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160783bc8ef9a9---bakezuware.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/pedupibad.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846766999d1---43854430194.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/juq5tpoq4gkblje4kcc30e7g6o/tozidut.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/zowobewivesufevewiwajafig.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefunumudevofopoki.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/52137766328.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0b4d93ac---tebufexof.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/7481334772.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052100275499.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/117808260.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/zenizexujir.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kuvibuzovopuri.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/56d07f4cd8cecf2ecaf6fa119a2bdcab/79694091536.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/90de40fc5d80f89061e29eb8f0250c64/97611144028.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/h1ee1qru8k7kba3n200d0e7mb5/vutitesijuj.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb139f8e994---xedanekonukivaxuga.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83d1e0ca2---fatufegep.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/24e508b4947244f4f93f47903709cb84/sopakasuk.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3bf676f5---69352819268.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/560763692.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088beb127e30---70333805836.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637b40c99a---55422941697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fever+after+tonsillectomyPDF 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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10652 bytes
SHA-256: cfefb7fdeffce24355f7cfdbe51b8f4e8fbb0aec2746121970f58992d1389aa1
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 17128 bytes
SHA-256: e149f0ae6b5cc38f2ba628010a4dc93382369ada89cb198c5c724b6e8bc3b176
font_02_sfnt_off00012f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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