Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd08114e71adc49c…

MALICIOUS

PDF

94.1 KB Created: 2021-06-15 19:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 52056390e7f1a58efa368487b53d51e5 SHA-1: 09809943f5009eddb4404d042f5b9cec127bb81d SHA-256: fd08114e71adc49c4f6995388b243f49b562e4ed42ecd2439a3536ee5df28eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=the+usual+suspects+streaming+sub+eng PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a42ed1396fd52fd795ff82ee5b12d046/domafomabexiwunuket.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/ginumuvemikozamubab.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f353c134---jomozib.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/46998387618.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a0f83782608eace3cfe4704a3c9f4b6a/66639192397.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-13/images/files/99459707384.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lth8bf79n0o26bq2j9118e9fl3/katiderubumoresiwo.pdfIn PDF document text
    • http://freeski.hu/freeski/file/8205457413.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/746124b38e1ce72636c7d633c8168f74/48705113569.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608354f21a615---dopabasukasew.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bapigetijev.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a550cce9fbbb6a883f600d49c2e02102/33375076841.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/13rg7khdr1kstvbr77aoqpac6q/bigexiluz.pdfIn PDF document text
    • http://limoride.net/gallery/file/texivemokorosufa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/081860f354646ffe8079dc61a317d46e/96509890360.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ofg1t0itiur3ntfqqs6hc60i30/losofudadulazajinaroxewol.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/nenuwogogolesisonana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014f04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F04 17364 bytes
SHA-256: 9c4f546fbc66c26996210dbb986493ed4ee12384175e3aaa61a3b6a3e936f171
font_00_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 5436 bytes
SHA-256: a86712fe96e91c4638dbfb3ad01d8e95c7f501c9700fb5e69c4fda0a2da5caec
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 17404 bytes
SHA-256: 87f5b4092b1da14c9d817bc471b5422091022185dfdd5cf06fde80d246aa92a0
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 13508 bytes
SHA-256: af265f7a4cff7dba5fd2b8c6d00e090a2dae6753c2c2beab71abeff2c5a879d3

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