Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc92ec8454480df…

MALICIOUS

PDF

88.2 KB Created: 2021-08-15 20:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4ff62d987e89a4c4a9cc56577203dd9 SHA-1: a3c2f51e841829aa537d6391c4f9dffb45c77a1d SHA-256: adc92ec8454480df5b29f157da11f9afcbc1c74b9c6bd3365bad4efa67700d16
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d10f82510---regetamuwedabewevab.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086845ad1f8c---dexujopuxaziwuloz.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/difisadosemegadewu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3e5443e93aa6971764d9002a210be264/30430310027.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/17402039503.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41d3d0190---vefipaje.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lusenunelazusodi.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/51413123857.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/vunitogepoberag.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073d67594d05---10632522981.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c63597a4296---tojojopotitasar.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/budar.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/47650203525.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/46161147202.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/8081783997.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/fasilarejiberekugud.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e3d9b10386857acec5dd829f64c04fb8/33043342670.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/70817557173.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/22929267740.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/13844152597.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/vefewirirewetajomukog.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a443c1bb216---37112739317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=la+danse+macabre+just+shapes+and+beats+mp3PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 11020 bytes
SHA-256: 06390be60b79bced92874f8a3651d228dd62998627d4157f70cebab69261d8a4
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 17372 bytes
SHA-256: 926ad8dfe13d5ccbba977ce70053a26877ca935738e99c3a99131f9a1d9dfb86
font_02_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_03_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001453c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453C 2976 bytes
SHA-256: 6ed9ce1b03f0bf3cb168882d4d447bb5a81efccc21dd389d6cd337628755dfc5

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