Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0bd10463f10f10…

MALICIOUS

PDF

84.9 KB Created: 2021-08-18 03:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76f55fcc4a7f101c9aaf4384c9141039 SHA-1: 2b24a3e629f4585ffcc4d27147313d7ec25dcdb3 SHA-256: 7b0bd10463f10f10524407e2ab954828bc974afdb1583cf0a71fd43e8dcb7dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qs8c3046bm03c571fbof13df7p/dosugufavigavatot.pdf In PDF document text
    • http://esistore.be/userfiles/file/66508463598.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0196521a17---59970510633.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/bamabapininuvagowola.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/29582104864.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50011297d8---gisupifigetarovi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9a1e9ce3---54342630477.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210701_221025.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/binazusogil.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a85623845---46197885149.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/24815130875.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108111748505268.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/visamalilapuvum.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vobilugol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449181f722---21134414758.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607996e879203---nitomavukifapojeloluso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3af64abf---rogebinokuda.pdfIn PDF document text
    • http://ruresept.ru/files/file/26046776781.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/7209849904.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/60880777760.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060814023067.pdfIn PDF document text
    • http://mopron.ru/upload/files/bopewik.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/lirudenurir.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217ed627ad---bexatofatifeloro.pdfIn PDF document text
    • https://noddy.nu/images/file/tazurejoxisaxivutoj.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3bb51a5f30841003362e82b2854a77a9/maxevisujekawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bartender+tips+for+beginnersPDF 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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 16316 bytes
SHA-256: 36698376ec4f7765206aa1a00ace6e192578d21d6fe76dbb5ccee852787166b4
font_01_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 10820 bytes
SHA-256: 12e3d57e069824427a2f8b221ff5d1fdf9c8c0250e5989d6be0e75fea094ff01
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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