Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d36ba9d4fa2560…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 02:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00af3fc27fd432274c189b041ace37f6 SHA-1: e5bb831d3df71b7046207155a8ad9f3641166449 SHA-256: 64d36ba9d4fa2560f5cf2b3a6352dd6f3586680e719ae05054133ae29f3b70ac
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for SEO manipulation or to host malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/88hvu1mssfj72dt5r7f7hf3d1t/surinumigizekumo.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19afe290c6---sejokewisexawibaf.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa238c81be---48601126940.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/79687007287.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/dbe6c843b6fe36ffee5f104a489f6b94/18566587251.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608436413fc8a---97670132044.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656491a2fd---50480376648.pdfIn PDF document text
    • http://allycatering.com/userfiles/zoguk.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/15834104116.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f909c398---zizezixonedipafiwukuk.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/56339401424.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609135541369d---8186058409.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9328847---xonajigen.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/kobuwofuj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705b756c437---63850167722.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210612_EED45486C27F23B3.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c562e29191---31044452225.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/niniberazukagikewew.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa5d08866---35132372863.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/bf9e1955c6030e49f77912377ace794a/wapenupiwanewajurololel.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/86042912018.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/56e4045305fe0e2ae7e858e5401d7e0f/lirexizixotobelusozuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=definition+of+mystery+genrePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e26151e8377120234f2e5565f3ffcd2f/bibitugidipewefeleruvi.pdfIn PDF document text
    • 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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 17432 bytes
SHA-256: a4dc9510f32edc7f93ff6232aacb5387f7200e333309545b0f18041fe4ec2966
font_01_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 10464 bytes
SHA-256: 82651867ac688a79de841142e89684627d671ce88ae022282450fdab8df133ef

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