Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b85bce1de68dd15…

MALICIOUS

PDF

102.4 KB Created: 2021-09-04 16:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7758bdf33d8ce805b446464054f82fe SHA-1: 1ab1ff858deb73576d8131a577c6a20d25094400 SHA-256: 9b85bce1de68dd1542c47c84af61aa3119ec23f387b2373b3b694ccb3dfb77b3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or using common CMS upload vulnerabilities. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdf In PDF document text
    • http://dpsnowodworze.pl/userfiles/file/25758402638.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161245cec4479d---52809988646.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425ada3892---fiwojerojedogamum.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/dodimolisamijokowe.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/sudajepojofogarigugikobaj.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdd9e789f---jumuviko.pdfIn PDF document text
    • https://maility.pl_adresuserfiles/file/60943050202.pdfIn PDF document text
    • http://qzgj.cn/upload/file/6647936768.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4f22afc8920bf4b23d2c7ab0fd6f5cc/felike.pdfIn PDF document text
    • https://tavio.ru/files/file/polobiwugunek.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/991d27a5bc2e5707fce661c99f68fb11/24701375274.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/baziv.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/594be7a1d74ed42b1a2afe09d6e0febf/50327929434.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/potinotutipeza.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/60562860924.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/31939956835.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/72482607202.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/ropiwex.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/83581545292.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/ronamakuzuwemojoligusu.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/84585433758.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bl9rh4vqlc4f5s94798jbc5st4/67372869507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bunker+hill+security+safe+manualPDF 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_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 10840 bytes
SHA-256: 11976cb10f738f5cd4b7b994e8b4a727ffa49adc53c91808041908ffb952886c
font_01_sfnt_off0001411f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 19288 bytes
SHA-256: d227fa6df8df00b7ca4aed79a63fe72f14b3adc01d7c015111719372f6812b79
font_02_sfnt_off000173ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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