Malicious PDF — malware analysis report

Static analysis result for SHA-256 0556617bd2c66f73…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 14:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ad40316707df22ce716573658574f75 SHA-1: 7e530dfce751cbb600b214e1f04274ec97acf3b7 SHA-256: 0556617bd2c66f73dcb9eeea22858a086b917687797ee8efeb9620f0f304e778
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely intended to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://chinhlytailieuluutru.com/media/ftp/file/kusogixerinepedaxorimapom.pdf In PDF document text
    • http://thepducphat.com/upload/files/ropakowaruvonaru.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5c92a0df---26478708772.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/64865408193.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/87151552053.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1er27rqtuai46p4hgj9mnkh4p8/nimezurip.pdfIn PDF document text
    • http://midel.me/userfiles/file/vevaveredarutar.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17d3de3e3---wakinuvunajowenovok.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/vesofenulatamifutop.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/62f137f38a467a4fa81abe7c38feab7f/vubuvovujagoluvil.pdfIn PDF document text
    • http://prota.ru/upload/files/77229207470.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99794c1fae---84734999991.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/32727752002.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dnvcgidsfl6blv4qvq9p9qoe50/noletarisalof.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/88943620421.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/puleru.pdfIn PDF document text
    • http://yanartextil.com/firma/files/13039006151.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6f7c22c6cf07ba6dfd7736d68f9b3f18/8227345211.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bekewomafomapikago.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/wakegopegapigedezosawowa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f8571545---rebitiri.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/11585236700.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0mh03l0ne39np3ei5e3ninfdf6/18773843363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=workflow+diagram+tutorial+pdfPDF 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_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 10708 bytes
SHA-256: 9e5c9cefbdaadb020362cb602540ea0d5320d3504284ce23cf4277612014c033
font_01_sfnt_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 15780 bytes
SHA-256: bd7b7c3b28e05691e492cb61404cabf3d85ef69fa7fce83824f106acdd423e82

Open this report in the interactive analyzer, or submit your own file for analysis.