Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ca3649c45d4b1e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 05:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c50e03a90a433cc6e3536be0a2344f3 SHA-1: ffd53346e69809e05fd23c2cb7b41abb5fbc70fd SHA-256: c3ca3649c45d4b1e2131ab60e3a60e4a177f44224d90933b2f76e588f165312a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised WordPress sites and other disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing page or download further malware. No scripts were extracted, but the embedded URLs and heuristic firings suggest a malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=doupo+cangqiong+novela+espa%C3%B1ol+pdf PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bq2g36adnvqtv6330otfti9om7/94938477215.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/73855653523.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/6560936111.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9426b104---takazatimunejuwopu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bdc425b79---wegup.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/47468815547.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/kakobu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ajofuxepezowebejoguze.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/77105347329.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/14478257333.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/nivupetevef.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/13213d19676a9b6fda1385e8efb04a15/51113390356.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zobisaruz.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/mozefenofux.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8db1775186---rijud.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e517ec407---4599944316.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/41aed318fad59d32dad282c229b8b9d9/87310969998.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cde8b1ee2fbe83433b2de5d399c09ca5/75543106217.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/towiwugimowed.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/18061235670.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/45684632517.pdfIn PDF document text
    • https://cncunse.com/d/files/82089011723.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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 18252 bytes
SHA-256: 584a1ee96583173431fc1add511375560c512eafc14d797f99864f9329d3a05d
font_02_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 11116 bytes
SHA-256: 55b160d642b5135dafe9e883412b5725984c222c4695f50499c522b81584ba05

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