Malicious PDF — malware analysis report

Static analysis result for SHA-256 856378d8493d6bc5…

MALICIOUS

PDF

120.2 KB Created: 2021-10-13 17:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 11d67a1bd38f8291c72c9f4885a4c710 SHA-1: 4ebabb814a8ca48ee45338f0d36b20b23efb9231 SHA-256: 856378d8493d6bc55f2512ab792c0a8fa0a58de682aacd3a046a750e0e707988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://muntepa.com/userfiles/files/bopiwaku.pdf In PDF document text
    • https://royal-art.pl/uploads/userfiles/files/60225615531.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f766d32e3d---sabaruzubozu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/patimewunasupi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1616597785315b---tagugefejifuzesibapireje.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/puwiwovipivuniwowub.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e81b27a509---vimedinukak.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/332f86d54c959572bf7a287b8ee43085/dewofuxedifefewunomizul.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/37880270051.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/32269184834.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/59923942776.pdfIn PDF document text
    • http://rnralpha.cz/res/file/lagebasag.pdfIn PDF document text
    • https://yellowstonewildlife.com/resaxudowupasas.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/mezapiv.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/fepamazilif.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/fenowalokepavexutotezigub.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/borojibolizaralezo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/79281981893.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/90241629829.pdfIn PDF document text
    • http://administracja.iptourism.com/UserFiles/File/47787987518.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7792d199---zomafijatokikitare.pdfIn PDF document text
    • http://esen.life/userfiles/file/82752820624.pdfIn PDF document text
    • http://lizhechem.com/upload/files/jikimepawunebaj.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/subobaxoredorofebab.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/13879374705.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=non+western+culturesPDF 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_off00016e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18625 10132 bytes
SHA-256: 2926f7deadb3b4a853894101e896114dc15386e1e5f0991bda4134fa8e24607b
font_02_sfnt_off00019d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D06 20620 bytes
SHA-256: c46fbe90ff1c43af3c13326089e5a208a574d468350942988c6a7c7630ab930e