Malicious PDF — malware analysis report

Static analysis result for SHA-256 268b5b0e29b7e28d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 00:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95c9033a72a3988f2d3cac78d3ec2ca8 SHA-1: b6474b3dab89b18d644431d3a6114d05a7faa235 SHA-256: 268b5b0e29b7e28d336873c355a017cae2f2790c79d0ab43344a19eb9f8ef201
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress uploads or disposable domains. This suggests the document is likely used for phishing or to distribute further malware, leveraging the external links as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://biosafety.biz/ckfinder/userfiles/files/91820014449.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/tufadexofidekoberuwov.pdfIn PDF document text
    • http://holzweiss.at/17085597690.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/81315292069.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/jinosexurexekirafu.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/40514120586.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071391e1d28b---jotetamiguridelugut.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/00bit3br1nckqmedq08tkfjhlj/27036785513.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c1306d6fa7c---divinuremo.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/34719351992.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rrm69dbci3hqdqgpfhu8udkogq/retobuwudonesutavukorutu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2809e6212---tipidopuvozulaxananifitax.pdfIn PDF document text
    • http://school15-tyumen.ru/f/nevolixowi.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/81328462722.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/ziborujewevelote.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///30541124725.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/96429912934.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/70039184024.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076771be82e2---53788844126.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3bc0855c7d48e7b67dbc2145f5e56028/lokanewo.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/gixidorivixowod.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d82e414c92---68325600768.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/xogamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+someone%27s+snap+with+just+their+namePDF 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 11060 bytes
SHA-256: 5d9bac0ba456c7957477a4f9f2a05101f74d24ce271505740c78cff1928834e4
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 17996 bytes
SHA-256: 0f9c249509ced84638b23b5157ad8d77b0d0cb56fb59a57dc58217b43e4940c0
font_02_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1