Malicious PDF — malware analysis report

Static analysis result for SHA-256 07563a13efc1bdcf…

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 05:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b256476e9f2626bb1b7d64e326b47ee SHA-1: 23184c3dd16eb85062d887a52cb9150659d0597c SHA-256: 07563a13efc1bdcffbb6b8c7b8a80886797cf5db62ef03d8ef4249343569be45
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=six+letter+words+that+end+in+n PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/s67va4jrta3nab3bvpaepn2spk/22950441401.pdfIn PDF document text
    • https://ocw.tw/uploads/files/zumesotetatamolifulotevaw.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/fupujejulonimolojibivisiz.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075d36927c96---38392087203.pdfIn PDF document text
    • https://labelmarket.pl/data/file/sezuwomixufakiposisirife.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/29901390474.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/92852992173.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e009bb3253---25835483365.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115028eb73e8---85971266806.pdfIn PDF document text
    • http://funperm.ru/content/file/nubegeragowusebofav.pdfIn PDF document text
    • http://art-ball.net/files/file/48997375268.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/478aacb27ea39f7442ce0f61da16b896/73593800985.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/42145142722.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb14a62980---33393169304.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nepf9l9fp6prmed0qsn50rc7fc/pirorefakixiw.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/9037697676.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607692460c139---91307716436.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/46998474460.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/vujaz.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608904ecefd44---vikusevefizuvomadom.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8987d0211a---pafawidakujikanirumorused.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/96061269537.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/3476111721.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/51efd86b4fe94646040cb0a25b820276/nanipuruvumavupegixefux.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e02d5fa98---63127199316.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_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10608 bytes
SHA-256: 9877b3344fc0626b86be0e10afe79345dac7dba2d726e720ba413cbf3e6a4780
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 18024 bytes
SHA-256: 38510d6c5bc24d43c7789d155b3735a2ed88da5cda6d4c2d37c4a523a3dc25c4
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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