Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fa8356f68233b6…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 12:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbda460311fd38cb6b95173103a85dd9 SHA-1: c7cd0a2656688413f6f7ac9189bea8872abbfc3d SHA-256: 41fa8356f68233b6cd09517393a277e385ae21b29ada2e7b811ac37efa59a4ea
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and other potentially malicious hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic findings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://hanurichurch.org/ckfinder/userfiles/files/xapil.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5qijrm9oebsrrh7i3rma3q9ssh/41146326583.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6b9e2850---vusegiravu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0da3192b---36855839754.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/45848618735.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/69794120540.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b3f623401---kekapibezasexerozub.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/jelatijekesirozadomujon.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f6a939e381cc3e6200017a1e20a7c781/wavimasifa.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/4453618020.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/53821562932.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/meluxawaf.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/74094941539.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3de9d1962e---64552624682.pdfIn PDF document text
    • https://securitydm.com/slicice/file/texijowuloduvifuf.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xeseduvez.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ho5qu0990kop2rnr886hjm08r4/52042420671.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0fbbade7---susure.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/026163c4129aff9028defb6d305d67ef/xevosexuvefokun.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210702_995A0E20B9CCC2AF.pdfIn PDF document text
    • http://trangtraioirubyhophoa.com/imagesUploads/files/54704969993.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/80373550264.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/jubosupewu.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/47610550485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+a+motorized+go+kart+without+weldingPDF 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_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 10856 bytes
SHA-256: 0651a58d2503b7ed593c9ec40d4eccc5f114834655b040d4eef587fae259f093
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 17840 bytes
SHA-256: bde1f1233299d71c23cba599b693f0688c248372fa326a0c3db530e76e54402f