Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dc027fac703eb2…

MALICIOUS

PDF

159.9 KB Created: 2021-07-02 10:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94c5273a0b86f7b2dc1678ab2506f9e1 SHA-1: 6ca055c83adeae6e7b543381ffa2f2086606bdd8 SHA-256: b5dc027fac703eb2eb33ffb310206bd25bd245e61c66a4be351bc7c52607eb4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into phishing scams or to download further malicious content. The presence of multiple external URIs and compromised CMS upload links indicates a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=interaction+of+radiation+with+matter+pdf PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5de678e4b---nupadugilud.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/26449315541.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c336438d---fediduwadovuvotunit.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609876101e7f8---diburajabomapox.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/fonexuvanet.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea34eb99d---walubifobogumemigefa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kuzipodotiwenegigomozas.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/68001b1d39a03cf07efcb9a83ff4350f/butewam.pdfIn PDF document text
    • http://palami.by/images/file/degonaxe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/500f7dcd69f6f91d9dc7d58401bfd8dd/pulax.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6dff3972---37133314670.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247a193099---lokakibumas.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/l0ok7uh91vnbqgficrvlad5gda/xalusikobovet.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f43cc8829cce51499604cdd7dcf8459d/nisuju.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/31794751051.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63de6b9401---31955450061.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/56901316948.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_off00020d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D45 19936 bytes
SHA-256: 4a5020eddc7e67f836f57a183d7160a8cf5a528ac62f774c13f45d8b24346f25
font_01_sfnt_off000241d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000259e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259E7 10708 bytes
SHA-256: 34b5a8ab1165ae300d0f0c10cf5156d725287cf41532af89359bcad01ca66d05