Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd44206d423965df…

MALICIOUS

PDF

95.0 KB Created: 2021-07-03 01:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b42086a63c97b35e806f2f1c6ba97d5f SHA-1: 07b35e2b099021551819020caa85cd4c128320f0 SHA-256: fd44206d423965df08c6ef62466645bdc20659748deb138b9453ddae231cb7f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The embedded URLs, such as http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52eda1fff---52864490026.pdf, are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8a6cbff51e024c869935fa48fb9bd072/suzidotegupovefa.pdf In PDF document text
    • http://gakuso.jp/image/_ckimage_file/genanorezuginisibebizoweb.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/80imav5gud5np38patrgo9spag/42445259005.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/nenazaw.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b760974e031---76236492977.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5ca6746f54f0f7302981edfce37a4040/85310889886.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/levidedezaganeluve.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52eda1fff---52864490026.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5c6d858e0810699b4a36669ca4fb5347/80101235726.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/2520535069.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/bopaxatipi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/8499267936.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16084596a12e76---96138402665.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4305064b8---85359327335.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/64888771641.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/48504329306.pdfIn PDF document text
    • https://mollis.rs//files/32172466067.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0fc52b961294dfeac1524a2243b1597e/xotupelijoja.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9d5f11428be9f3301b49d90f08e9625e/45947215186.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6pq9u01970k9d8gedqtufndhqd/59440294449.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b53f159e0---kofopunobijoxe.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/93987448869.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86abcd745f---29389302991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+brown+dye+in+minecraft+without+cocoa+beansPDF 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_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 17856 bytes
SHA-256: a214297df0c69b14da73bda6fe1ae85272091537b2030d510adc08a17cc2dc34
font_01_sfnt_off00012584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off00013b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15394 11216 bytes
SHA-256: 301c17127fb06a355011fea4900fc2055fc0b8b376033835a3bd39d0b4813b3a

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