Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8d0fb228fb7f2c…

MALICIOUS

PDF

76.3 KB Created: 2021-10-11 03:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9909e2339fc4117cd6d303418e5b0b3f SHA-1: a8b1d33f31d9d864a3c92d749a4863c82e174337 SHA-256: 9f8d0fb228fb7f2c9e149043a46bcecab47ac2e87fbadf02a905deff2f01030a
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The primary goal appears to be directing users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=running+meaning+in+english PDF link annotation
    • http://azco.friend-match.com/upload/files/852164809.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161610870366c5---44232667471.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/18695389150.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/32759730659.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/jimipizupeduradinefovag.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161638b0875b71---25718942946.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/11137985996.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/92656217819.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/31618221745.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wimekezujusa.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/77511069776.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/xekowojafonulunukor.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/pokorukubudimar.pdfIn PDF document text
    • http://tzsunup.com/upload/26157922627.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/xipawirabukiwidofojid.pdfIn PDF document text
    • http://kustari.net/userfiles/file/bodubufimejaropepabomaj.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/divebevokezowuwolo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/18395628358.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/galigapabodaxipiwurir.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/42456859150.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/82314061850.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16159542783823---38662054320.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139685f8606d---zaxemanasuximalixena.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_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 18732 bytes
SHA-256: 38cdd26f7795f330ad00d84cde5302813786ef4362823342581cebc95a736a9b
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10380 bytes
SHA-256: 2cbd502455cba1187fc8421b2a21256a59afe4c899412d8efa34f49d194e6094

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