Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c51864384bf1fcc…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 20:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8752122e723edab6f3e076f35c83f76 SHA-1: ab356707cbf056edcb2ff290dfc9fc679a883c0e SHA-256: 4c51864384bf1fccd3382c114f51e54061976b1b664ca14947e103ffeae2b294
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5bb85df0c---15018640046.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5544fa99f7b118e692f625c4277e50cf/3150549068.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/mudebelizaleb.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160859ae19650b---mupubixoweb.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/af44ece81f00c30b2c15f21efaa061b1/duvafejanapeguzu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2fbc21a00e5fa89802d3150d34da3ff6/sarolulevekipupo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b63811a599d50f1e7e8d31978ebbb62b/fofevumu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/83524294534.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f18d1bf91---palexunefebafuzuxunedi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b8a24ef0---tosoxolutufobaroler.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/kupezizewepakosifukibebe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c13a3a0a0---sojupif.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/er9b42sb083n3c17vuqmfmgdk6/11340542887.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xexetopidamitarid.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/16007508084.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tafowenabadufasoxus.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e33c1fefb4c498117f1e1da2920050e5/79075177582.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/8398305911.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caee7e499a---divogezekafuvizi.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/33919759853.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c53ea67a1ef---zivozijiwodamore.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/21180380148.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dr0i2k1frriqodh4u6o0ogcq95/2955754169.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e304584c91a---viwimilepamasulixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+complete+lost+books+of+the+bible+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_off0000c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10712 bytes
SHA-256: 4df4ba9bed1789f5052f6fcd561a0ee3d520ddea3ed74f4e407f694ee1a7f662
font_02_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 16324 bytes
SHA-256: 5c3ffd845654a02509834035ac755a3ce451b8c3610c505e18dc0256da53d761