Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c350279e31d035…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e655f3fe0c2e0f7b717427de14deb7b5 SHA-1: 7c73a358f575a5c5254f29ec9f613301c7392bb4 SHA-256: 25c350279e31d035523c1f8b0d5591b471b082c7fab67b956798f1e1ee6aa66c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The embedded JavaScript stream further suggests malicious intent, likely to execute further malicious actions or redirect the user. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=spark+commands+cheat+sheet+pdf PDF link annotation
    • http://architects-desk.com/uploadsfile/7255081275.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd47fa051c---gabevubixobowiribijaviwos.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/79270734707.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/5709334859.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7026313f7---getefinifu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/3560094673.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bab43e5dd---6543664509.pdfIn PDF document text
    • http://chinahongji.com/d/files/vivegigiwotudivi.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/zasazenuna.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/66233822283.pdfIn PDF document text
    • https://mackbeks.com/files/file/tiromulofakukusunaja.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be23730f89e---42767073891.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/mexapidadumalatake.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/18a5debc280c84ecb2a31de1cd79588e/pofupekugatomolumidazudun.pdfIn PDF document text
    • http://industrialdevices.in/uploads/xizejizavoz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc51cc0897---mononuzobusuge.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/jitotozudaw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161277e87c1d2b---xotukuzimitiposisidu.pdfIn PDF document text
    • http://topflexsports.com/uploads/tibojutexugoluk.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/47481014292.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/daforazi.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/8324148022.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 10912 bytes
SHA-256: 03d1de36036aad9d3420a4f7aa812c1b936fdcfdf8db330c4cc87d7021dc51f8
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 18636 bytes
SHA-256: 384ba5b2bc6ad28a351ff3a53860af20985b97528e16f7acf8947e4d2df62cd2
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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