Malicious PDF — malware analysis report

Static analysis result for SHA-256 1673966fcd3e2c63…

MALICIOUS

PDF

98.5 KB Created: 2021-06-17 16:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4d1270b4e71621c4bccec55a3fbfda7f SHA-1: 42d16bd21808a4eb7c798d1c984e39db88f7e348 SHA-256: 1673966fcd3e2c63c2a6c7511f002ded23ff8d656ebfe6b2bce577e6e13cd2f3
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 0.9992

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://synerhu.ru/uplcv?utm_term=frere+jacques+piano+notes+easy PDF link annotation
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ea822c5c7adcdfe80fa7fefbb9717252/76628578674.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267fa2e77c---1104693552.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db108d3420---dexemewuzujefetefedipopu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55368e09f6---tevogafirarirobum.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b79622091---pizefitevixowoze.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc80dbe88f---wegenumedadim.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/negotibigixerusi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160989914aedc9---fumigasojaluxotonejapi.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/81758020940.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3b2e707737d2da7a77d3ce80a62c21d2/pefib.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/31512227970.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/93517776162.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/12336736394.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7b19bfe2---8524188888.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09908bfbfa---luguwepefe.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/votozubulelozowonefena.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8v9t5cvto46bkmuc0oi6phbdi6/27175268742.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://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_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 6416 bytes
SHA-256: 9532c11c657f7c50cf5e248f51f7e75f19dc30fc344b947627fa884a2577a0c6
font_01_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 5156 bytes
SHA-256: 3638429dbd205bc6db8e9ccbb319677065ea898c231dd4bbfd340ce71a0b9887
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 3404 bytes
SHA-256: 6cd22ea291c0803ad8f0ce0f6dba073502306bf7a99b641837c126d193243092
font_03_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 13372 bytes
SHA-256: 2ba43a9d2a4f3c009aac6b99f67027a7235a5968828ac5947d00b78137862141
font_04_sfnt_off000164d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D0 16060 bytes
SHA-256: a1e2968ca8c7638dd4bef022e186f3fea2b098bc52bbc7b81535a6634822059c

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