Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d1ef921c284bc0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 11:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eae58a0757e7748a0487d6ad4a8d2372 SHA-1: 6bfafe280b1c6947149be49a0116f88c66db0f9e SHA-256: 90d1ef921c284bc0545aedec4f3048f4984d15efcb6db1d9b5b58a3aa675e418
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, including one pointing to a raw IP address and others hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple link farms suggests an attempt to obscure the ultimate destination or to distribute malware through various compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://selltoob.in/ci/userfiles/files/26508239932.pdf In PDF document text
    • http://ohappy.org/userData/board/file/funuzabagav.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/oga8vu8rok5l0qa89hqqdpepbu/20941355581.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/74694625322.pdfPDF link annotation
    • http://aimic.com/userfiles/file/50775072174.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0e1a92c4134c27296b72226acdb81dac/lisedofalojupo.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/51195101318.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7c1fc13a8abee093d2097c86bdb5dd9c/pafudiwixevobuvoxo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/petojajinu.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/8941296639.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba873cf26---kokimanusozirazap.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/gowurodakepipiw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d8d941921a43ecc217fca3624e6671e4/49318974602.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608544aaa040d---44894478641.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/webigipofikobasuseweliw.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/54981697846.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/62467698984.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa963820a4---17899086057.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118032c171ae---gadujalusenewamodir.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/dung933i005ijg9rej91rurkb2/mogozubuwibeber.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/tugejowakoseboxevobigeluv.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16123720b3a292---bowunokefipari.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2460809b5e---botasutadolunegib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=law+of+attraction+pdf+download+freePDF 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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 17132 bytes
SHA-256: ff27d863694b3578596c2044c127197c5e3f29f0e5fee228bd9e0deffc9d6d30
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 10488 bytes
SHA-256: 7f4a2da0b681eaee60ce136dabc7f7f43f67f3d573ca4d6b682fcfb860f8a16a
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1