Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e5df0e2007fc4c…

MALICIOUS

PDF

87.6 KB Created: 2021-08-29 08:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d7938e91f94463f242017c841f0b65f3 SHA-1: b31d8315c4ccc952dbd85a677965d737056e3884 SHA-256: 15e5df0e2007fc4c5fe93cf00f5e44cd2a82b9cd0184b3af6c65012864f9ea4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=what+are+the+products+of+the+calvin+cycle+in+photosynthesis PDF link annotation
    • http://fapannimario.it/userfiles/files/97377976948.pdfIn PDF document text
    • https://cape-electronics.com/media/file/63277790445.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-12/20210612220930897385.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/xuguwusiteladodo.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/71431594400.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d1650c58231b2e4ae9e81cb1ba243ce4/28581156504.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607a240266042---585796478.pdfPDF link annotation
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/dowinarorolob.pdfIn PDF document text
    • http://dsagco.com/Upload/file/94063540032.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/betepebujemegamililajisuj.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9b3cde27u8lnn77hdbmff3qt8n/19845257428.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/sinexaziwipipi.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ab9c651de94bfb7d12c3eaf2673d82dd/65606808637.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/pezaxeleji.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/42796111313.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/seninin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f52c9ddce83036db983bd199c6582694/99774141177.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f516cd70c---jemakikopetedawu.pdfIn PDF document text
    • http://haphadoor.com/upload/files/timufuxofewur.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xifojabokofepakitifefu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/47979640870.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e5251b6a---bakagowijipoda.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad204b5c2---zaxezavikopoj.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_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10992 bytes
SHA-256: bcade44e748fc228185211de4c647d3f7e6740a9bb7eb17e17272c3a39b58a84
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 17872 bytes
SHA-256: 2606c9cff15a89fe902e0e84e4e0c3a6ebd7ce6f2f8f384afc4b2d02865c95a4
font_02_sfnt_off00013820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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