Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc7634d8cd6c0f4…

MALICIOUS

PDF

83.4 KB Created: 2021-07-20 15:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90500902212bc29d0d29e14f2853c283 SHA-1: 81644388af80be6f54529e0b059d10a8a90db0ad SHA-256: 7dc7634d8cd6c0f4bc7856dfa74414ec89790575d32e20efe057aac36d531983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this file is designed to host a collection of links, likely to facilitate phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc52e839c---zowevofenikovabenis.pdf In PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/5e2e5098f2a522b3d2094732b6a810c3/70977560914.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0c65130b3b18dbdae3ee97d0a734c840/51682530080.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/449d345cbe1cd7eb2777f54215efbdf7/61727705173.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d38e64ecc9da484016438c226a20cb48/33166476717.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1ce1012b077eebea5375ca1288f6a2c/rixejifokeb.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764a9be510---74581347426.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1p2iblv0i7qccasaba09gi3pkc/11694552637.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/xegirulevibalubaduwuxapud.pdfIn PDF document text
    • http://candientuvibra.com/images/file/febisowutisoluvukad.pdfIn PDF document text
    • http://teplospectr.ru/images/files/22798085594.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/7ka32oeo4nugnjsb64veo0atd8/84377564794.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/76959321741.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/68197994512.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/51483637964.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/pitasoligejoxedewudituzix.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c664923e8c2---95580952756.pdfIn PDF document text
    • http://arslanemlak.come/file/2528000911.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/57941461775.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb467bae3---zizulosu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e994e09c---nuwofolop.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b4e13f2be79dfde3d27b94f269b50f5e/nuxakakurowatanumiliwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=p+type+extrinsic+semiconductorPDF 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10784 bytes
SHA-256: c0b6ff0a8335450ae51821fc8c1e4e0ad0c1f696fd416142f3989210b6989cdf
font_02_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 16716 bytes
SHA-256: 793317b703cae92ad56ce23361a03b7ce80650ad68f72c64b4543483d09c0927

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