Malicious PDF — malware analysis report

Static analysis result for SHA-256 af576881b942ea17…

MALICIOUS

PDF

78.2 KB Created: 2021-08-19 03:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1b715311825e00288bd40f2ab38284e SHA-1: c4a753ec1dd4ee561b0da9648dae96ac82d5e68b SHA-256: af576881b942ea171cd57a13dcacdbd6de528447d6ff7d928f42929a9ebe8e80
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pixomot.ru/uplcv?utm_term=ejercicios+resueltos+libro+matematicas+anaya+1+bachillerato PDF link annotation
    • https://ags-car.com/upload/files/40686087939.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/15580110410.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/kuvurixuzenuziwit.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wopipujefuteno.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e1e251de8bd06112df55418b083d8498/rezotem.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da5deb27b---62337013508.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b7e608d0---5715350778.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2425ec24---89890675600.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f494667db---33662809183.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/utbjmohd3dn3jmc0lnkjk84950/35724542812.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0205d90abb2e7d8ac6c656bbb2b6238a/jutixajovulolaxapif.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b446fc0a75d24b58b2e55bb4eb5b6537/guwobojowe.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/gepafagetiwagekovobiropi.pdfIn PDF document text
    • https://bselink.com/userfiles/file/nifigarevesepejuvejevoxi.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/22935329083.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb086f9f1---21669044665.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/4768219491.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093756960ed9---jofabijafepekukeko.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d646f719f01---lefomaxenijudimikez.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/78718742060.pdfIn PDF document text
    • http://artside.org/data/temp/file/xixoxutopimebetevax.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bea4a93f2810e4026ff5bbcf2d83ea70/782759489.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/dasuzapokesimasinazu.pdfIn PDF document text
    • https://alutat.com/data/file/51413511121.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210714_FA9029B02E3F396E.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_off0000c99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 11016 bytes
SHA-256: f6a06f4bab9f90c952261fe714fff264442f3c3ee8265025716343d107b50f6e
font_01_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 17888 bytes
SHA-256: 4fad3cf6a6223f345bdd3d7388c29f5e94fd0ab3117dca00aa9e06a10acc6486
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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