Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bb279763cf72e0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0554e19f8f785825a3010395f61e2bac SHA-1: 7155b5741afc3fcd1594c0dc3632a76fd35bff4d SHA-256: 63bb279763cf72e05ffb3d519e957531ada2deb83e499ea207fd7171da65ad4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, pointing to the file being a link farm, with many URLs hosted on compromised CMS upload directories and disposable hosting. The embedded URLs, while not directly executable, serve as lures to external malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e3b3064f8---kukifalubel.pdf In PDF document text
    • http://vhshf.de/File/12435530637.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3464a727cf---bugeruju.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/48464965910.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/nomugudawenonixatopera.pdfIn PDF document text
    • http://grupophi.es/uploads/files/48713352595.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/fedasenovenaxo.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/nifizilibojejewitatesibe.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c9b72d06---89489150669.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf80c84ffa---ganiverogarevafinazofa.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/46458169775.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/88384103862.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/beranidopitumerajotoregax.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/apc70lc4oo8jvhncip5v3i9a52/69535441170.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/vapudasumixalakat.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/jibani.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/fijeladeretuwisifimeberim.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda6ce15f3---72204864782.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fcd95570---lipiripi.pdfPDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gl7itiefgfbfkvkg16pb0en3af/jotid.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/79626343413.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/p6t8995lfrk4vpt11mbeh4g5i6/xibinumeralo.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108010806251901.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/47211d6abcd1a769517fd259fd23af0d/nidutajotuzufobonefak.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/xufuta.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ee0b8af40836549ba9ccd4220ce37cf8/xukizepuwitapinom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de685402ce0---tuvif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=marathon+adanac+3000+digital+stopwatch+timer+manualPDF 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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 17960 bytes
SHA-256: 3436b86813d1ec0c8265918a4d9cfa5fddae108ae56493b92ad8d7c7e28db97a
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 11436 bytes
SHA-256: 68da2476705ca0a64847b545739c016cecf33437240f0151a3a5db63ef89d43f
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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