Malicious PDF — malware analysis report

Static analysis result for SHA-256 a516d0e93f771a43…

MALICIOUS

PDF

88.1 KB Created: 2021-08-12 22:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 58ce10e13f8538d667467cbab98a6db4 SHA-1: 28a025de006786e075aeecf790245d2172c190b5 SHA-256: a516d0e93f771a4339fb63aac464fef7e9d775bfceb6e01021b382f9b62ccf43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with multiple URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://samarpanbharat.org/trila/userfiles/file/kixadulimulivanowif.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/210f7a1135add5a14c6beda4e07dce03/kazinezilomejikez.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/dizoxig.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14380273993.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bivmkdhp0n0s83sacg4vph7bi5/92583118384.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0e6d1f915703f6580061a6b57150d664/bukititidiwuwekobavimeg.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/29n2he247niiv68cgtg4jhu1s0/taveselenovetisezologes.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1aaad17ef889722d5a7ea9634be82c/8686175870.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4ac57f931d896d38a7482de8764d14d7/wuzalotalefexezi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/k5pg6qvk9obsb0lcg0s01b6jol/19175587103.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/gobelu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744c602542---lupijajafimamutap.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e61fe954790---girikosawemavaboboxulutub.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/90518583504.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/donexoluvu.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/futuvatusenuzutasopakito.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/1259105324.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b4a8001dfcbf3debee59bfed4f305018/87238165351.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dagagojorus.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/39509835020.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fa04afd0---4421437394.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/33103113988.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/zukodogufiparadijewakasin.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/35371833605.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/wutuguzenejubigav.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/11160114286.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/natupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=is+throne+of+glass+on+netflixPDF 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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10548 bytes
SHA-256: 21a3cb5e0b6708693d21825373bbb2dc813be64fb0c3c2d42c16c7520b6f1e00
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 17592 bytes
SHA-256: b0bc395429a7e3ca978466383bfda01184c983d18f2e6aa1793f5280642259aa
font_02_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1