Malicious PDF — malware analysis report

Static analysis result for SHA-256 a739c9a2205091d3…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 15:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de219f8db1e5b8034231843f2fb404b9 SHA-1: 4045f482c75c3b782aea642bd99df0502c3a930e SHA-256: a739c9a2205091d3bfe9d0f626662ac0761beb0b3fcaed3de307e0a2f770895c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites appear to host further malicious PDF files, suggesting a chain of infection or a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941fd72c7a5---kupam.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076322431f57---71808885865.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2ad713c---48308276116.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607669e4dac9c---38406463880.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0229ca262598e1b44e8ab4800d6e7b43/luwogazatuvu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/1a2a6d83f03c7ee24edbe5048ba02f34/12456012457.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/51632620941.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592f2bb8dd---11439480510.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/tmp0kl4innrghlif6g2n5lt8mh/77806006265.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7a9a140c---gutobodedovowatiwiro.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/4221093757.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c12229109fe---zazabuxiwowozot.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/56310c231999bff114680f7d90649d55/93180855586.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/wovudezujul.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/18958284281.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jibemilokis.pdfIn PDF document text
    • https://kopari.hu/files/file/gigif.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aao2c084gk64r13avj49n8t6ct/jenilomawoxoluretuzek.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee269d233---68507691111.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b61de2ca6---ruzuzumanulevifavumojaji.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab9aaea01---welolezefofodezeratibobi.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/mupexozeganajezope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=easy+houses+for+minecraftPDF 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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 10752 bytes
SHA-256: 4a67742ff51ceef182df0e12f79392b07684966b871b32ea00a3e8808a12dfb9
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16720 bytes
SHA-256: 0ba3c8ff90237934e7407a453251b6ef8a3266390e807c7735138b4e669c9d8b

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