Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8db7399dff77f5…

MALICIOUS

PDF

93.0 KB Created: 2021-06-28 08:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 853950e524ef0f0bcbd05c195c4a7df9 SHA-1: 5cb9380f6ac23f44a22ad3a0d1df36d9dc23e7ce SHA-256: 5d8db7399dff77f5623b1d001325d671f5236e3ecf1ef4b118baec1bb8197350
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737260004c---wedipimibifapav.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d3e574813ae7aab9f4e1a4093aad3f70/94379145084.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/modeferijewewajuten.pdfIn PDF document text
    • https://serka.com/serka/upload/files/42082792870.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/ruvewumunubikijemerimen.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qphec4s9g9ghoa90gd5t0g9q09/zizusubumukabijamaje.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8540cd977c33b1629a0dff9968313e4e/65087759814.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3e2cc3d5---nejezafasikazuditaz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c068d0c3b---jujazilotujelevez.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a66da71bf31---mifinizezumadesogaw.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/dobojajisixo.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/dutakuluk.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091903876541---73251085159.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/dodedoturuvavijufop.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/69405577490.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752262d74a1---79522313530.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a89fb18db4888231389a54453299b6bd/36516323148.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/33375714688.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3dba37ce1054fb46a13ce3b026011eec/zolariwojifupobid.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1d80378d---7731309491.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4881f28fcbb53584386e85f9231e45ba/62629722197.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/47036105437.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/nebulogisatan.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/latebolilenilegakof.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ab8704553d555fe859fda4564df41b2d/50220105523.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/neloxexososogasewiwuzesoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=7+layer+mexican+dipPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 17252 bytes
SHA-256: c81e70080521472bcd8a1a4c8bf0e95c4e2c7ee56818d44e2c9499955451f717
font_01_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 10456 bytes
SHA-256: dd079c6e452f6d5f0ca52578ef73bd0504e6b4dbb4f43b31cfbe1257592413a0
font_02_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F4 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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