Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee5c79f8fd6ac79…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 323a5108e2332e7a202c78ac4612950d SHA-1: dc3b1f7abfcc0e2a49ca5142369914101e6a3d7f SHA-256: bee5c79f8fd6ac79bf1be47cf74c5ce96d12dcf6b9b47821988dbc9e92807e01
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, distributing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories or disposable domains. This suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ninda.vn/userfiles/files/jutakewudugopesutus.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141624fa264d---paxegidatowemifapoxek.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090710460560.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/vuzowefevogodovuki.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/544793402.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/fujezonowebadoxobuxozafi.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109101923083826.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pumorikikimejubedemuvaviv.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/21338090007.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0498d9bd991795a524d7bb3822320a92/nubovazizatimigadi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dikas.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6d838e4---40721754166.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/jozivor.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/likoxilavikafomu.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/jiboriku.pdfIn PDF document text
    • http://potlista.com/file/files/ketapozepuponekaxo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b925d825---gidipazipezogoz.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/kojax.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614233edc1757---23306745991.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/sigisuvurinuwosevusabeteb.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/lerowuwusokisagag.pdfIn PDF document text
    • https://artbynela.com/uploads/file/55054878160.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210916_160039.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400aac65828---ruzukiwanima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bring+it+on+streaming+onlinePDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10504 bytes
SHA-256: 807358af73cc0fe333444ba3b076176a4e02771650caeb9e28876003edf5a4a7
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 18120 bytes
SHA-256: 02cf5aadb776d8f6f9b803424976dd6e87eb2d2153887c08f77c53bc1b6d0d33
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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