Malicious PDF — malware analysis report

Static analysis result for SHA-256 178920eaf29920cd…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cfd074bf6d0e01bb4772d0e170da317 SHA-1: e5159dab8a9b5bedcb4e29dedf18b8fb2e3d7198 SHA-256: 178920eaf29920cde6886811ac952bc03294e4bf6783e99314ec3670eaab5166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and link farm heuristics strongly suggests the document is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sinosteelcode.com/filespath/files/20210907225239.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb791edc82---nefugajeron.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/bagipif.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mugetawanagakemadiso.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/tidabidifudazaradodemoze.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/derijaxoto.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/6020408567.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/topigavubovejolozi.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/xejakavur.pdfIn PDF document text
    • https://brs.jo/userfiles/files/desolurifebirosusavunewo.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/jelijav.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/15620851189.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129c9bc5f4---77153024731.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/48596031107.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161381fd2bb6b6---garopowevejotaz.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/33953815014.pdfIn PDF document text
    • http://esangsok.com/upfile/files/96572723050.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/wigovasubojonemagigukul.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/300ba5c28f3e383469cdf6f279d97eab/55054568437.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/mewabujinisukurajo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f423efd6---64365260397.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/77985875939.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/23039148602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+online+money+generator+ps4PDF 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://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_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 17456 bytes
SHA-256: dbfdbd20dff730bcf2c1fcc17727b35cd1208bcc51eb418845cc5aa6f9110e45
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 10824 bytes
SHA-256: 79885dceb3bf05b718b90b5743db9af24b6c3c6009dc7340a42bc5d6837b01e4
font_02_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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