Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b9f1b6b1721ef4…

MALICIOUS

PDF

87.1 KB Created: 2021-08-09 20:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c3887903706b84111f64b190b418274 SHA-1: 246f32d180de448f7552a56ed70217427e030c30 SHA-256: f7b9f1b6b1721ef403beb3a60b44fb3cc7cdb10c19d2e6320641e91f1f98616b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The PDF's structure and the nature of the URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://changrung.com/ckfinder/userfiles/files/16865492905.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e6067bf3717---66590103125.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/juvif.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c95m0q126ec2ev1olc1mcrdbdc/wezaterilufugizifel.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/0p8vulolcml5dn4tdlvb21sdvl/nuzusuvalesuz.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c67e188d4a4f22311a8b803bb580f9e8/18256610403.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/biwosenuxujofufi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16240058804435.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6j0dval1pipivln5pphm7td312/zozagoxesepike.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/xofamuged.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/58763489484.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4f3d12b0---fitototu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/80566372954.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5711987aea---65713722260.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/83572903734.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/selefagafuwegabowexexig.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/25576132480.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/12584938694.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/61975330878.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/282981382f34c787826bf2a0f91d6b8a/wifiwinavaxukubakejaveruz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed706c807b3---jerudatixususebo.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/23573447488.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kuwobof.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/rewetaxoregojo.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tijifuxima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=teor%C3%ADas+de+la+personalidad+schultz+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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 18516 bytes
SHA-256: e50ea8c78d91707147971991e49562dcdd79d2767261837679d0b45d54007733
font_01_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 10904 bytes
SHA-256: 89d32d664a6ed4a3bb32176335c029e757fb26bd6488bafb7a36678df757d345

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