Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99961d62ccfcba…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 19:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6aaf29f8ab3fd49b5e33c99b4920c08f SHA-1: 40d2f0d56c53b10aa94a5764d0fcbac32d78cb5d SHA-256: 7f99961d62ccfcbadc5b46ca433baf56f6dd9523aec3cec767c04a50df3103bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection confirm its malicious nature, likely as a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=download+film+fast+%26+furious+8 PDF link annotation
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6485182243---99963288202.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/14366908438.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/83752860639.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725eaeb81d3---faguvigobusofegiren.pdfIn PDF document text
    • https://mmszke.hu/files/file/gorutolorixawevi.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/fipozibeboviporepewev.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/48d8b309dd390c8f3a6e9be55eb3e094/tirekonogoxukazu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/majatixovunudukabobosoto.pdfIn PDF document text
    • https://o-dance.com/upload/files/manopuzajajevipejenikusu.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/lezozugegazanelawanotow.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/925c75121e515478c25137634855d963/43048732019.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/656907b5dce063a58e88063a4598cbe0/110278466.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/lupasepiginowaberof.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/zawotapata.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/ruvefifano.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rmnf65j182ef1aermcl0p3s9i1/ropunowurebufoziru.pdfIn PDF document text
    • https://music-group-store.com/upload/files/27047198337.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/959f147accad87a310a0eceba0a1daea/32920251239.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pf7lqom0uug7uch26pnb6os0ki/geremolipiditivepob.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/senuxolupidew.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c0ee71de2---bowogomovi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8648d10bc---pisolugumurobewukebe.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/29995304686.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d0527004---bijuvizoj.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/43777573624.pdfIn PDF document text
    • 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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10372 bytes
SHA-256: 0dfc06b142c9bf792844a9ef125377586fc211be4bdc1459a980f8b418920565
font_02_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 19984 bytes
SHA-256: 1a9907c51e87b953a4f941f95af345b6ee752dccc05f17523676da358d9f0370