Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5865616062304f…

MALICIOUS

PDF

98.6 KB Created: 2021-06-08 19:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5bbb03256c966a83676fccfd4eafd414 SHA-1: df9b565002651a652816bccb68ca6b672d88a202 SHA-256: bc5865616062304f103661bfe3c1d29fde81ccf5a9907bbb4982f30e8e19ee98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to 'free download pc', reinforcing the phishing lure. No scripts were extracted, but the overall structure and URL patterns point to a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=tasty+planet+forever+free+download+pc PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078809473fb0---lawitorojikavefa.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b997a1d8dc1---80124927607.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160785a59bb0a4---98540565398.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wixilesifameguwotal.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/m8icv2ndhetpppqii58hnlecs6/17743783542.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/basovidivajoxagog.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080f167ca34d---somoxalovorujoxaxoxefama.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/ziwedobasutemimesag.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/10862996079.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a136f3acd63---3575023028.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5da7b507125ab13de7542f390474d2ca/seditifukofesukuzo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/moxisitizulebeba.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6f3hf7lcav27h3ruumh9159p6v/3028739055.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210523194857131.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1b4a9a6ad919887b167aa4c52000d3ba/riburizupitiditofogedupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10916 bytes
SHA-256: f775df7558f100832a131ae211a640bd5011234c5caeda6ed0889ae72c5faa60
font_01_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 5352 bytes
SHA-256: 681b445bd235aca359c5f4eb357a61b50e0ce5116f255edf25514d8bdff043ba
font_02_sfnt_off0001428a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428A 10840 bytes
SHA-256: e1052de494e688d5a19a7d8488edf6a4a58c7f08371baf119479abad9c44ac8f
font_03_sfnt_off00016792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16792 16076 bytes
SHA-256: d14a31a02ce1c4152bb15d5126a0dec4416b44fa6c82943fd1949f8858d11b01

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