Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcd3c24c5d8d639…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 03:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1719ff1d6b3f8f858eb59a697b63198f SHA-1: 9a57b74a60185067a948bbd8697feeda5a66d17b SHA-256: 7fcd3c24c5d8d639830982a0c77291d450e0c9538514dadfdbd312a9a1a974e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the detection names imply a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://samuiluxurytravel.com/Uploads/file/bitubarebipi.pdf In PDF document text
    • http://artospace.com/pics/file/38463299451.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/54239021126.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/30332442654.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b1de6bb0---57177320866.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bnq1ruqrbtdfmmh05up4lo0i51/61705144390.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072d3e30e2---15987169185.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20217151823403614.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/bobopisugemitikadazo.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/gigotovepusi.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/neluwikozutowugawuludes.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/63081246083.pdfIn PDF document text
    • https://drsaman.com/files/nazuzojevog.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac71386db---13504936173.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/sanelodajugoladaxoxapezu.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/jixojewavijolibugabor.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9b9o0fo5bu4ldlmhrccckrt03v/liwagovagisoto.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/ropusi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36000409109.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/8004812277.pdfIn PDF document text
    • http://ssp.by/var/upload/xusikeji.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8084572b1966af95a9fda9114aa48197/94548624334.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f40d219a---letijunagetobibororabuta.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0df52003---zipegonumox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=desmoid+tumor+meaningPDF link annotation
    • 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10644 bytes
SHA-256: 535402d2f5fae3347d6cb3effe0550bfc8ebe8a5a5a07a786909e4a01ced4a15
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 19780 bytes
SHA-256: d903b3704b6b47176f9d47e34a06d8c9fcd1bf22b524f1232ab0904b5844e606
font_02_sfnt_off00012e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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