Malicious PDF — malware analysis report

Static analysis result for SHA-256 8894fec60828b38d…

MALICIOUS

PDF

100.4 KB Created: 2021-08-10 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0a89008e34cd2d843b52f081f58cef93 SHA-1: 469c8c10a441f609ef5f54be9fd87e3bf33bf661 SHA-256: 8894fec60828b38d707a4c7b9d2cb565f0f8002fb9964bf4d59e97c491c55da8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous links to potentially compromised sites strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/07ba528aee660df060e4f01987ff4d5c/pekirefizazelijut.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4404ac8505---68019911364.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/758b3380affc0dc5adb8711c67130894/wazazapokejoxokagopu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2d9b0f5e3339720166c6d5ec3539023f/51508333967.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2b9984d6---dogiwimux.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2a00b545---59701186035.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/46204d6effc0747e389e661117dc700d/nejulaxovovugigikopozot.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/33382317006.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/37309833139.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/moxemimutitow.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/73480143390.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qcdl3durti87g3g52hpuuls39i/18606095.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429055857964686.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d7cvvcp41c93ak8ggtvg2u63t3/16633081448.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/14850669705.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160839465672ae---kekewirazalol.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff12fda6ed---joluvifupuvavove.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/bikofesonupakuweded.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dffcbc265---tizokuzej.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/59003835819.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ee8eec61e---rusuxosepamixefo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086746f6f597---femorenumut.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60F6D526A2C6E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+ser+inteligente+emocionalPDF 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_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 10604 bytes
SHA-256: bc2887384b6d317163f04009445e6627fbb73ce3425339016909c8a15d39337f
font_01_sfnt_off00013b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15382 18512 bytes
SHA-256: 081c96abe9400e000e10fc8318a97d11a70b076c77b2ada4e13ad90832018163

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