Malicious PDF — malware analysis report

Static analysis result for SHA-256 246c9adc60cd2993…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 15:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dafbec4e39fcfc03b0728f07e5641d9 SHA-1: c2b1bf9b355181cac63a0b6556fe2a639380a7dc SHA-256: 246c9adc60cd299364c86a7cdf34ea9fc08e616d77ee4bba6108f1287461e0f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scans. While no scripts were directly extracted, the presence of PDF-specific heuristics and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=zarchiver+apk+android PDF link annotation
    • http://excitechem.com/userfiles/file/makozogidemiguxo.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/mukiwo.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/49191093396.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8lfkep0vvqu1fl590i4b1m8nf4/wuladutoxekulebijavusarax.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/34258369608.pdfIn PDF document text
    • http://poorclarescork.ie/images/55893865520.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/bimolazolupeji.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132981697---22100030061.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93825588341.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/ripuxokedulolalutimov.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/vaxeludokabipugiko.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/21336544863.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d4880lvbvr4ra8eeurj5lpe1de/23050992654.pdfIn PDF document text
    • http://huefpdf.org/upload/file/75989809671.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/23437611969.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/luvolimururivevolifeker.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/vimumowuraxose.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/33453656956.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/79696223382.pdfIn PDF document text
    • http://deltools.com/userfiles/file/79102928460.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/1387196570.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_075622.pdfIn PDF document text
    • https://digireg.at/upload/24910071674.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0218deabb821e06af02e1101e18ec4cd/26169490000.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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 10420 bytes
SHA-256: dc88759a13e6cedce9324d38f643b33feebd78c6374d386a5b0940d646dcecfd
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 18012 bytes
SHA-256: 33a247acd2b4e1ed52ff52b6d4d7884c9a2d913cede6f1de6ee052f6b9d70f8b

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