Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88efb1dd23222c5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 07:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 500688ae5e6db66df2910cac7de77dae SHA-1: cb977a5a8ecd454356fde9a8ae0063881b4f661e SHA-256: a88efb1dd23222c5431c0cd6d033b7c93b48b7e51d4153c2c06e318ad8d4bcdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=acelomados+pseudocelomados+y+celomados+pdf PDF link annotation
    • http://benhvientantao.com/img_duhoc/files/zorokujoduvuzurenatira.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/902660867.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811da500d12---10935588992.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4bb293727---56318578202.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210723153832.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/wubonibinixek.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/nuxazoduwokuvexepizebula.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/76709127046.pdfIn PDF document text
    • https://hoalavender.net/upload/files/nixopekisewovekida.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/tipizoju.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071944b04ff6---5338517223.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6e7cf912---tojovoxopibafonajin.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/02b5dd0308c5dc5241c87a346b86d4e6/59535877439.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a986e661fe---ladalab.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/sowenafadiguzal.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/konokajurixub.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20218251432151362.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/66586691947.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/derinibikifilavisirukip.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/34170109643.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704d1a93306---nesufodejide.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/32139299793.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7860d236---sizivudugasezegunedoni.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1845c4af38---28722254631.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 21208 bytes
SHA-256: 29f5dd7cac65deacb1f4632d3610821f02c379cd83498cac04c74e495d8a0827
font_01_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 10580 bytes
SHA-256: c8cbb099893c7f1c91c8bbfbd77f7254267758b219d87b2c8abcf6991363b4b0
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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