Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66e792387ef3de3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 16:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e7696a1e49b9a03c218781598c6d9d0 SHA-1: b23859de9dab6e60e9e5efca13de9c99e8f8ef24 SHA-256: e66e792387ef3de33498e03bf440dcf70ecf5daf8f902ff0280d38e5312af511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malicious content or revealing sensitive information. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=factoring+trinomials+worksheet+pdf+a%3D1 PDF link annotation
    • http://sahamit.net/userfiles/file/30021714919.pdfIn PDF document text
    • http://195exim.com/datas/files/kupewinuwavi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7baf7e694d259998f8c9ea3a7ca304f3/43363700765.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e7157335e2a---mufonexepaxebebijewiwi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f757ff17f0---80123698212.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/boxapixibuzol.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/43d2d2e1539ff3284920b5beb15742c2/kamolumikav.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae36e76504---9802094768.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/ginavi.pdfIn PDF document text
    • https://pecsikult.hu/files/file/83971078312.pdfIn PDF document text
    • https://kultmotor.hu/images/files/25515394640.pdfIn PDF document text
    • http://inncredel.com/uploads/metobunotos.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d018ab526f---xipitexepuluvinor.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e2f415802c642dbe50bd5e1b5264aec/22682384927.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efaff40efc---wefamavutegeb.pdfIn PDF document text
    • https://ckmandarin.com/uploads/weneduketon.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c0eeeac2abae002dc3c472bbdf033c/dojubekemovilakosobava.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3d8845d6f6ec3dd99fb7bf71dc2619cd/wejuvedudu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529000256.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210901145036.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lifemenivetejilexejagof.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/94843866130.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc21f04e4ac---lejuzaxozanaliji.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 18560 bytes
SHA-256: bd0b4ca70738113c19864b0e0c36a4e60e8cb1c422d37d2640d6d3ac23c43ed7
font_01_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 11320 bytes
SHA-256: 950c28a999d31e978f7dc2f91a848fcc060837f6c3ad2f1e1e66b28035485a9c

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