Malicious PDF — malware analysis report

Static analysis result for SHA-256 643528047f583a81…

MALICIOUS

PDF

95.9 KB Created: 2021-09-02 22:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41e9384f2a15a2d8ab24004a60caaf12 SHA-1: 2a4fbfb3acfd67994b9b056d6281ef69ed4ffb35 SHA-256: 643528047f583a81604bf2557ea70e2eb3fc05d7e7fd833742e48f1af137947a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=children%27s+separation+anxiety+scale+pdf PDF link annotation
    • http://eventclub.pl/userfiles/file/85526140280.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/28784936710.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b112d32c7---94954400712.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4943fa40---vewigovosigezo.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/45710734512.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/vimipimulotobezobanijama.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/23412460121.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72237394089.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/5164776076.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a39690921e3---74727376218.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bd73440bf---xadozinudev.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795ba704c2---gojunog.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01e879f19f76879f4e2d4193383c6d56/nerozosidigizedamemozudux.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28a57d206---dusimej.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/16514857856.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/30101581285.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/firut.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a614b6f7ea9b3ff0d2c101e03b75a9e4/vunipikinovu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/92085960524.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/25156570403.pdfIn PDF document text
    • https://zzhqhi.com/d/files/67423487096.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57a7ea7d1---zulusuwobo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b2a9af2d5---17199189574.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_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 19752 bytes
SHA-256: c049f9847f30119996ea4c7d8c53dda105e856d1dbadd5ea5cff9c2856a0e9c5
font_02_sfnt_off000157fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FE 11000 bytes
SHA-256: 78f26fddf78b9aec8eb819e3852a5d608ccba7bb51c3364310c8f5f1ac9f762d

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