Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5ccedf34b59fc9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 21:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d1a322035013044c5379c46cd81bf82 SHA-1: 6f3712a83768903fbb3be296ba63238c6db88082 SHA-256: ce5ccedf34b59fc9db9559d06e528d3bf9b1b41fc5eff1acadbba877fc31a397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to potentially harmful content.

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://archism.ru/uplcv?utm_term=lollipop+camera+apk PDF link annotation
    • http://geoodwierty.pl/files/file/xozefunarigamesejunabo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed729bc4e---jumakarep.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/punewesogugimoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143fb62d7930---37171496985.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/rutakekagoradivenosa.pdfIn PDF document text
    • https://guijek.com/userfiles/file/sesenepisakufazorifazixa.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bakadutugatutoxofifotab.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910032706.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/vuxisivekorerazu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138c487a6e98---30288726901.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/xelofotezizar.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/tokalutokegusonoxe.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/38761380333.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/puzakovugozekazube.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c09d7958972d3cd155b4c671309dd9a5/62802758224.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/kamesososalufekidewifeja.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29c9b3045---52184839959.pdfIn PDF document text
    • http://imoroz.by/upload/file/xulutex.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/xobat.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5db6fe7a---zidipesifuxubofuben.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/70356146679.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021941943134569.pdfIn PDF document text
    • http://dsraxys.com/uploads/38458036239.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///15173292136.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/jowaxav.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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 18284 bytes
SHA-256: 3f569a8a95ac279da36dcfbd6f983bf47955cce821fd9e165bdee5ec3e773060
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 10212 bytes
SHA-256: 79985fa58f85e52475e17f9b1080bac31980d33a6922dcb3bd450efa4f987c28
font_02_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1