Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e2e15ee8fdc7ed…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 06:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24358bdb1265a9e3a7b43024484e8218 SHA-1: 3d981b409a472ff84f4a348aaa5e595978c353ae SHA-256: 19e2e15ee8fdc7ed6f6352331edde10002192a3c07563fd6ba6e934a55a7bb2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to manipulate search engine results or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tb8b365a6c9dkp2ahra9qt5au6/59948107127.pdf In PDF document text
    • http://st03.it/userfiles/files/9660966049.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/fojixejawusoliwepek.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d12681452c---48665561675.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/45055143042.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/tozitusojujaruraxatixos.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/82138289705.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mivujoxatukasapolebalo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/16701703915.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/70834041405.pdfIn PDF document text
    • https://cecprint.com/images/file/11382411098.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8241929f---rukalelola.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/90004962760.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/35482330349.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe7733856---88451172321.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/27573440365.pdfIn PDF document text
    • http://artospace.com/pics/file/86795538520.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f114ca96e7e---xuzekoledumofepuroxazod.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608391a92e122---2772937400.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/99563dd8efeda6499c09ad9638a49a4e/22979407412.pdfIn PDF document text
    • http://ashioke.com/images/library/File/87259418745.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f0d4qgdmvirr8490sp518easa6/52053112575.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/sivasujaxo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d73140579a9af24fc13405f1c64b38bd/65080692778.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jifam.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/22662196140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+reading+comprehension+ks1+worksheets+printablePDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 17956 bytes
SHA-256: 1eff34f907bea1c0e6ddd720a233f81a9979587a7b581572a507064825720a95
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 11308 bytes
SHA-256: b5ce6e044038be5b0779fbdf3da46a94c2c5607f47e20ce12d137c6cfd9b216b

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