Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb0d84cff11b526…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 17:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e46780bd4ebccb8655dc09985ba7583 SHA-1: 5424900f97dc97bcb789f941decc4443b39497d2 SHA-256: feb0d84cff11b526a7096b9207ac59002d0b4ae6c05033d466fb6e8ac80fc0f2
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains external URIs pointing to IP addresses and compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is leveraged to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://market-oborudovanie.ru/upload/file/74858346295.pdf In PDF document text
    • https://balaji-technology.com/userfiles/file/kupuxuxuzebimaxuroxer.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5468174f---zosekigejanuwevidogasixi.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/gavulevilediwavege.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/57741716461.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/rukaz.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/83321875944.pdfIn PDF document text
    • http://sns.hu/_user/file/lebaxamuxatukuwoboxedanag.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/dowavopowadoronolilajozij.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f3771ede936d1c3ab99009624323d2fa/65777989385.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/fokutikelidirenedini.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/bekisubuxib.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/bujutubuj.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/qa2akl2a6h9aj1bk17651l9u64/nitubozawamibutup.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/velazado.pdfIn PDF document text
    • https://primer-spb.ru/files/files/polubulenugopig.pdfIn PDF document text
    • http://cl-pub.com/files/files/99430453854.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/3440988113.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/12290183096.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/bezuxisasizut.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/25131142564.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/69354311629.pdfPDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4eb3af83a---sigopaxajojezevowedob.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d601e25df68---82908330420.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/79835563855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=area+de+corona+circular+ejercicios+resueltos+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 10824 bytes
SHA-256: d8575f6ff256e4a9a4c29db61c61c5879951d8e5a237d4b1fad06f1a65753c4e
font_02_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 20084 bytes
SHA-256: d7e597a1a9392196a6c5c4ecb33b266ce697119f49808504e6a7e9a173af8aa4

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