Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f37bf1276838bc9…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba9b0c04beef50a5cb16e403b3fab2cc SHA-1: bd58fe7128ad353697f2e71953d4f1b348a5e9f0 SHA-256: 1f37bf1276838bc9253377a7e10b52570b23da6e24ece304b5840acb9c2d5c1f
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of 'LOLBin token sequence in document text' further indicates an attempt to disguise malicious commands within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160805b9336ca5---39760364870.pdf In PDF document text
    • http://lakesnwoodskerala.com/uploads/file/pidebubigasagok.pdfIn macro / runtime command snippet
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uutdmvodog9v5meeor1a8ekj13/73737315753.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/tt5a654t31duguoetk01itdh2t/64362974667.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bf35da02---59748890701.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nugotewusizusosovobexedu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40d145c8c---30109754643.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec3916190---rujizavitewugalaf.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e285a0ca05f---ratukazegupudajagudoguf.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/50850475945.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607614a71a516---gazotavivo.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/makutekabuk.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/46591403448.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zilavagu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7de9bf833070fca7a52f5929cba2fd84/35040252566.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/wafijudolasenuzejubosob.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/pajabatojuwu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/zulize.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160838fefbab74---22007088990.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a3ba039fc8d8ac22e88d950cc37c997a/35078406018.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/76407102895.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce629f2abe7---9290086792.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a821df5df---jofonoponove.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/c8cudn0l59mtr2m3c9tl31v3js/wogajekotewulalewazabel.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/piwabekefababotomadonepu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/fiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=step+cut+for+long+curly+hairPDF 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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10880 bytes
SHA-256: 3e0aeb6d33684ee1ca778cf0f2bb2d2aaf61a0c2dfd30fbb8cb916857eb593d5
font_01_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 17172 bytes
SHA-256: e7b99921f2cac5ad6f14d5b7d192d6f267edfa00c6e451337f0074ddd52bf449
font_02_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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