Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd2ce34a5eba5e…

MALICIOUS

PDF

88.7 KB Created: 2021-06-19 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a46780b93ba96ee1eb94bf6a4a2f646e SHA-1: b72d033b47668f657e1f092bbcee4c0e26e6bf92 SHA-256: a7fd2ce34a5eba5e5785d1e840dbffe2fb88edc95819b8c5a6df12d474d9d746
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 0.9993

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 http://daedukgs.com/admin/fckeditor/data/file/20210601070239.pdf In PDF document text
    • http://kayamedbursa.com/userfiles/file/68042695356.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/55791209234.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b713069d0a80756064db4783402bb8c4/60675792706.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/52908516703.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e594a207bfaec359ba2c010134a338a7/mokusonuresuxisogi.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/79155349413.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8809815288---65229318012.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/69038955971.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/wanifutaxidewururobeferu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e3d5209e---diloxad.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/rijimibufogovavi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6a167798---kisabemojibar.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609163bab095d---jobefirijaf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9503553c1---71434171292.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/31bdebb72512a74b193e4a0d56555deb/kimogalopi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e45071f97d---54966540809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+blackpink+forever+young+mp3PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 4076 bytes
SHA-256: 20be6f3a23aa70645340cd9bb22755c6e83f87fe3111b2fba6ec1ae3a9b0f21f
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 5720 bytes
SHA-256: df85e635ff30904eb8bf0f51ca533a6c2e8e097cae93bd41f066b8cb41874328
font_02_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 19668 bytes
SHA-256: 439000e97c88a3e267aee1bbc0f55f89a9b295cefc85ca18305103097d0469bf
font_03_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 18872 bytes
SHA-256: a5483dc79facd3a7a2108b966fd05a666e7fc3c959350e751f42feb614a76894
font_04_sfnt_off00014642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14642 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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