Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72e05a7c5513947…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 18:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84b54802291dbd1725b5a2371befbefe SHA-1: 2d52d8cf6b1a23a472bb9c7c2a70d24d28d7dc01 SHA-256: a72e05a7c551394797fc02ed4c83702838f4fe8bb92935dd924e721f5a89dab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160edaba34df5c---piwowujafexe.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af25576a1---midojuvisiwinenubexodu.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/liwofutolilum.pdfIn PDF document text
    • https://zzhqhi.com/d/files/80480618709.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a3eb45943---10286200208.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/gisulujinasi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/jalijel.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d966ab0a21ed84c0d75cd4499675112e/56062518864.pdfIn PDF document text
    • http://falerisztika.hu/tmp/97671483010.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/55108697929.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/xelerupi.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/77655460529.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608010adaafdc---23824327000.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/mamimosowumuzigese.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb727e3650---75165337855.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e254b5947b---rafifuviraxeminibobu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/981ffd3b2917f32e7d2f0d9f733e8a4e/65836161262.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8fafa180a6dd2ddb3a507c09cd8e1c4/denabitijelalerane.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c05e66709---saxukup.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766197dc90---jeluwedakavamiludokikis.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bidenuko.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/sepunusarepoxexugiduwidew.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8697c99d---2053172948.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5b26ea2d1931e18b4563cfdc3dccd619/kuravinugalofa.pdfIn PDF document text
    • https://proia.bg/userfiles/file/85776841028.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/folebumenoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ingersoll+rand+2475n7+5+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_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 17572 bytes
SHA-256: 53e9553ea7c43b869518e26013be41a91029e3972caec614e49fee2d8f9f38ee
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 10836 bytes
SHA-256: 5a7dbb0d7e4a4ce09be1202e35168146e55df232863e0cfc971e59f03bd93a20

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