Malicious PDF — malware analysis report

Static analysis result for SHA-256 f224706a040a4209…

MALICIOUS

PDF

84.5 KB Created: 2021-10-06 06:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b69fd059f2ae496098a89aad3e060cc1 SHA-1: e01e43571404256a9933f5e92ed8029e729bc996 SHA-256: f224706a040a420969fb413e117ca1dbada7cf68562fab7fb75e6d28aa973375
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The presence of external URI heuristics and the 'SE_CALLBACK_LURE' finding suggest the document is designed to trick the user into visiting a malicious link or potentially calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=i+am+very+patient PDF link annotation
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/lejikorez.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/6667615282.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/turetanapasuwip.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e5dda7e1ab13b17d1c331d5815e8cb42/13421168795.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/5155149315.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/50868010638.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9dd5e3a40---juzivigoro.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/gepokagikikewuxesoni.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/ziparivusul.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vavufobuxiroburotuseno.pdfIn PDF document text
    • https://aitalk.vn/upload/files/45965951225.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/71689402001.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/77265788829.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/22301055659.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/vebofaripabagixuzese.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/71496441944.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/ximanezosupaput.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/34580929414.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134164c445cc---90071063739.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312fbba16c4---7486158062.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-5/20210905000951741864.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mefeg.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/16293317150.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 19520 bytes
SHA-256: 5fbb52cbd6b900eb526d09840461adb26f23d4cbbda2153fe9d036d8acf8e0bb
font_02_sfnt_off00012da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA1 10208 bytes
SHA-256: 65244f3dfd96d847b98e59d6103b7530a00c1ef43f115746ac1df240212896be

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