Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f0901f6f8b3316…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 12:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8f7a288f3eda8bb516b341d30ec3430 SHA-1: f37e34d80fd7f33ff94ceccc5aa92cc8ded80ae6 SHA-256: e3f0901f6f8b3316fd17ecf0d877c4e657ffef4403bacbd97872ecf7f11c3055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=b%C3%ADblia+hebraico+portugues+pdf PDF link annotation
    • http://firegallery.ru/img/upload/68321087108.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/85924763223.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/jekerone.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/76108341555.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/rogevesovamigunotize.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/nevedudonedewewefusivedun.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/zinofotapaxijofatage.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9848c3487---15463356310.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lijewevisajusuwugezune.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/488b5e4a8869fc13adc3b0d78a8921cf/89367039187.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c478eb2f5a---mebugizesitijoso.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b240f8053ac---94565852833.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/72065036164.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t209qgjptp9r108pc6ft03isl5/kodujugumufegad.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pafebaxudemaki.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/gugodeboruvisibisajolumil.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/3d10d4a1c12f22ca1bca1634ef94a5dd/47168227416.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607830f5889fa---zuxutolimi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062511312173499.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/kumavevesoferubijij.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5fc04e0df---76877742901.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/nekus.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_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 21888 bytes
SHA-256: 876d715ed39d860eb721ad6e14357cbb5f224e40f7b845dbdbfbcce258b30f26
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 11152 bytes
SHA-256: cd3fccd55c1c514ca48a6c022be648a1f2001c8f8ba4b769511cdd5ffaa1a87f

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