Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab30b857cb57ecd…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 20:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77d3935cc908b9b2309c175f016ad57e SHA-1: 938ff5028a909a02c141edd2f516b758fdf8d298 SHA-256: dab30b857cb57ecd6742c57cb22d2c09540b3ba8a73b280ec9b559deb5ba1dd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and points to compromised CMS uploads, suggesting it is designed to host or redirect to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is part of a phishing campaign aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=8+ball+pool+auto+aim+apk PDF link annotation
    • http://dichvutot99.com/webroot/img/files/legokejarobabiti.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3d87a012ca3964f4d1de2e7b6a887940/taxejilidiwuzak.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/88073614480.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/30936700551.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/81125190396.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zinudusajiferakazikax.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/fivugumi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/85335401046.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0ac3a82243e351015872e570fe982cef/pexavuwutogavorapetexivon.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60419713136.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/67950514188.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426bfdb47e8---91784392158.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/59958199850.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/76129398754.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/32647849064.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/17185822760.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/26906015383.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/wudubesufumejinawuk.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/garokavubikamukoxadiwe.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/95226163018.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/geninakaperaredozes.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010952544189.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tewuv.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/maxodoripiwovukirimuf.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/56336505727.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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 10352 bytes
SHA-256: 4467bc4d2e9285c150e846d0af87605b617a9bd966b569250d3c1a5ba8b29a26
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16864 bytes
SHA-256: de9859f81074b409517b21f0afe7aedd40a5dbf8a9460e4d0b2fa4c317384db9

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