Malicious PDF — malware analysis report

Static analysis result for SHA-256 62edf43597714c90…

MALICIOUS

PDF

105.3 KB Created: 2021-06-11 17:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 66d690bfdca48930b0e89dffeda8f2d2 SHA-1: b73d436481fed127970fd583f4686c7ca65f550d SHA-256: 62edf43597714c90f331a98154d3daf1f340285f7fd5046dc166dfa090b55a0d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=verified+emoji+copy+and+paste PDF link annotation
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21e631f91---54816804969.pdfIn PDF document text
    • https://citytrafik.nu/images/file/buguxifefutodosuxob.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tt5hp33vg2p8f2gq7ffr2s279h/bodamu.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/64782021990.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/88059866013.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054e8bed68---22272364757.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3545b5432f---22287059832.pdfIn PDF document text
    • https://elektrona.cz/files/file/juvikefala.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4419c3c8---60277275144.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e82d895af8013748699da21343e9393b/5102459944.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094783895ce7---69722294142.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7fa6fd19---rikopereve.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd55ada35f---zeliwugafivilexagawuxur.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/jiborunivapu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/63776866819.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67191253d---4787235661.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609254947b704---17255329801.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 6880 bytes
SHA-256: 76b64d74c17eb75e2af3d0b5d9b6c1f0603e1607931d8ba7d9b3d836c853847e
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 3268 bytes
SHA-256: d5891325e940551a2244ad35ddd24553e764ea2cf1f59666f6f216797fdfdecd
font_02_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 5412 bytes
SHA-256: b3bbdf4606d47a2bcad9c29e927b3d686029f61f0a5eab2d650cb61086e9a21c
font_03_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 9896 bytes
SHA-256: fb4a1534ba3cf98f3d0b973eab8fbef49695a12dabe646e165408ce4407379d6
font_04_sfnt_off00013507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13507 15880 bytes
SHA-256: 3fb9de284116ed5c895e74069e5183f8e49f800cc55ccf090d983954c17bfa98
font_05_sfnt_off000167ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AD 18400 bytes
SHA-256: 54ec3c3c94e8be0512c77a0e0326d74d378fc768e1bc09026e109cb3a86bb7aa
font_06_sfnt_off000184db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184DB 6252 bytes
SHA-256: 96fadc34214c58b8b8d3e715bcc3271f73a10f1a33a171831cfef99e25535972

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