Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e71d137e69c1ee…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 15:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fbe950780beb6f0da7cb8c56da1f52e SHA-1: b95b75658d463f113dd8fff1b050d49311e84e5e SHA-256: 19e71d137e69c1ee5e3cab1481027a5b76a39f18d8d30150bdc8c3d47f2d5397
176 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 CMS upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised WordPress sites and a raw IP address in the URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/32689304c80d65f3f2995eada20badb1/kugopazodokeki.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/da739b0f11024bdf182dbfb824f6ef21/26819373028.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zatuzawaba.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/kuwilaxedigorobudigixu.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/xivasivemuvuwebewaxa.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/13156862243.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/72725013771.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/aa7b3d9e30753c5a201a48c92a86d476/kedozavobu.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/52041679162.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/wagojovanozemuxexomukog.pdfIn PDF document text
    • https://conrays.ru/f/data/49153962823.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181cebf1d3---58274164955.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/fuxijutugir.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zaxukufibizizopokefano.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ae4e305b92c074bbf3ab680931a4b36f/rubanosi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bc40d23970---puvunupisok.pdfIn PDF document text
    • http://unseretochter.com/images/file/tameguwexasubelivora.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/75d66a367ec072993e3b5e6dff47fd6a/fatulesurawinigiximerotit.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/3118950934.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9d7e2f706a8160293b0646728948da5c/89875533010.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53c608ab2---boropolujimi.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/buvexuxefup.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/juwiga.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ec3ac495a---86927141122.pdfPDF link annotation
    • https://divinenine.net/userfiles/file/170343397.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/68158813822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rosqueadeira+super+ego+4+manualPDF 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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 11008 bytes
SHA-256: ba38406f1915216406118e964eba0eb182d2515031209d5bcd36a1d4af2a3ae8
font_01_sfnt_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 18128 bytes
SHA-256: b378102aa2ee1b58bd41524a3c334019f7dcdb86140c1d194e456656be2ff47e
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1