Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa8ab931dc1d599…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 13:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7eaa8e4d016d33480e2dffd23cd9f98a SHA-1: cee29affa83189092d40dc75c31ca76cb9c5da71 SHA-256: cfa8ab931dc1d59958f8c2dfda4fb335009c1ea4881eb872df85faa82b4f47a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pistant.ru/uplcv?utm_term=political+sociology+pdf+notes PDF link annotation
    • https://dejavuruse.com/userfiles/file/xodisebofejamagasokejega.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/xobukekakamofijixojejom.pdfIn PDF document text
    • http://lawngo.net/fckfiles/11183112467.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d313d70ee33efea983b961ee4c29cf2f/83330303222.pdfIn PDF document text
    • http://chayka-svg.ru/files/83368130208.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7f605d82ba628cfd39b7e25d885d7665/ruwokevofazafiro.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2dca4a6b---suledisuwekeke.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9e08e3ee5c70c172162309b819f70252/nupinoradorezafutixur.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa68e7c5cfcaaa26094b93b8e5028fad/69152554237.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/98290608872.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/21059786224.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef304171a---70248139799.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/49149451964.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/64f58d033af7e74b89fff6de9d35179b/welenozepigeda.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/de297c23862073ea36c0f311f1e40881/temodofawu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510051531210.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/rukamuvitukuza.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2a9cb6b9e4847b25f0178a242ab7efb9/lisapodezedur.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/lenuf.pdfIn PDF document text
    • http://championsview.net/userimages/49795086493.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67545ccb5---dajagofi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c9562c79d42---wuzazalufof.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b38c860ce---rijixalol.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_off0000c4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 16944 bytes
SHA-256: 3f9f42d5cf16929f42181806305d2b000919796e5ebe242428cd8a436529e2ea
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10808 bytes
SHA-256: b475e1132bc58e80970c3394c1e318f308d01df7c44e0f2e6b5ba4b066648222

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