Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08250a85511b846…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 00:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a322e16fc9e3fdd896ee7fe2049413ec SHA-1: d77b9918de80516d55c4beba69e219e774205924 SHA-256: e08250a85511b846bb49005f92af74711857ff24baa4e1cb50124de0673fc9c0
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. The PDF contains numerous external URIs and link farms, many pointing to compromised CMS uploads, suggesting a phishing or redirection scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using link farms for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=the+catapult+clash+with+pirates+mod+apk PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc0c3b38a---91943822610.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/vofagiroxaxiwewug.pdfIn PDF document text
    • http://klsele.com/userfiles/file/1632322985.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/83100352244.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/35503780694.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/86492687089.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/88920889897.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/17hsa2okl8d1dbtv2iujak6qhk/vopekeriwokago.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/romiguzeneraxurewis.pdfIn PDF document text
    • http://talesma.com/E/file/direre.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb258b6f8---mawaridu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1633a191169067d2eaf8138ef2a8455b/47724527392.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/sebip.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/30881461638.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/jixinakitujago.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/jumewel.pdfIn PDF document text
    • http://nakajima-ya.com/user_data/image/file/2020262482.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e5fe8dea54f3d471dc7ec634d70806dc/18541000012.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/birasujetu.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wipokavixosaledip.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/piropivise.pdfIn PDF document text
    • http://hkalc.com/userfiles/67961030265.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/60400781565.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/63176052467.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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 15156 bytes
SHA-256: a9e7132b5cf6d545b2893dbfccd16891111192fcaa806a900fc9fefbbed8a2b9
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 10916 bytes
SHA-256: 473bcf12adc6eb956d6e0edf44a019eab52ba5a35fa69e652f8a39dfe5e3c10e
font_02_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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