Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d5ccb1ba4e6c1c…

MALICIOUS

PDF

114.1 KB Created: 2021-07-03 10:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04d452262df85e0de54269966633eb78 SHA-1: 029710cf78482d57f82e0e4c868e6abbf8ec5215 SHA-256: a5d5ccb1ba4e6c1c806f04c7ed9da2bce5e74d3158012e72dbc272a298d49b83
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 ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://jrmhandling.nl/upload/file/falavurozijezawagub.pdf In PDF document text
    • http://cortabellanews.com/userimages/zaribevilupofulafomenamav.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809eb419351---73065588457.pdfIn PDF document text
    • http://ministerium.pt/files/82236480475.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66dd7b410---30986059313.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c83952a3df0df43848b9c9ca0eaf0f57/88127278672.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/xazupanonama.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9efce8f97721680e7560ea9ee8451002/xodovodinamunazijovax.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a661a7bf1e1---jupofagejom.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e458bf0d47---13637833612.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0b32a62cf9b4a00901dd22a231c47780/37302594901.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/e5mh61t837alq3etnmib4vnard/zojidanolegeb.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc4477e23---mabuver.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d5de6714---64035677990.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f5d97121a---88806888381.pdfIn PDF document text
    • http://fructusartis.com/i/File/pewoxose.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/sejoxavuximomo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/29318472565.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210624181136.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160977b1d38b9b---68170973250.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/nudonanopositosagusezuxo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2d1d9eaa6654e64d0d3327faea01cc36/sanasurujesujized.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8443b3476c---53036161245.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/73c9c9d29a641f1aaf2c1445522eb8c7/fofurufan.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fb3fc780e0300c4b34248bcd2dbc1a72/gibokikonuzogunivagetuz.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca60fc0e50---49554632736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=top+10+rich+country+in+the+world+2020PDF 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_off00015e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1D 16736 bytes
SHA-256: 1ef3216946c48e9e874b2ea6563ff463b4880d83ace86b4b157f26befa51d6d3
font_01_sfnt_off000189ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189AC 10840 bytes
SHA-256: a5dd3195db9e122297a5f01e1f6afcf1444a9ef6daf7b0655473a198bcf8ac5c
font_02_sfnt_off0001a2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1