Malicious PDF — malware analysis report

Static analysis result for SHA-256 987648878334ce4c…

MALICIOUS

PDF

92.3 KB Created: 2021-08-22 00:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4953b3d2c053f751f4ff8853ce8acdc SHA-1: 20a0f7d21d2099a180a3c62b7a32d994443ee61c SHA-256: 987648878334ce4c28585eb7f2f45b46c65c613269581a2170cc873277941987
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://coiffurenais.com/userfiles/file/46389565428.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57882ef913---zejutupesatixuxopavu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wegudibixanowav.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eb4iepi411l0j1hbc0bette590/20245477477.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606edcba025a6---gowililovedofaniko.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/vivimomumipopem.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/14273679861.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c088076a0---milajenesinuvato.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/mepododuzovugolu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8dfba74d---vitumovomudojomamolufala.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/wetejejovakilirasudokanul.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2261d7a8f---33008840524.pdfIn PDF document text
    • https://signika.pl/Upload/file/vabidexetunexutipodopez.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/hvntb77oaj418escihhac0hq15/23389377973.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/59216708621.pdfIn PDF document text
    • http://traviet36.com/upload/files/65794989996.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fd39941e3---90989963533.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f8fe8954597495f7ae3738954655be70/zigikibesuw.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b2c0eeb5834ae5b0f99e28b60fe561e9/xexorujofewibelanubiki.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d23267c15---94994116367.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/91582246813.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9de888a0---16145355573.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/mituranabegimil.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/55783717972.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/4515095570.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210723_0F4AB3C157B3B9B9.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4601fe26e91e1484308e26ff5e06e9ad/41246326797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+does+c%2Ft+stand+forPDF 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_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10460 bytes
SHA-256: 1493bba9a04ce28e46be9afb4f0b7457ea90ac4b5285295a38fb96b9552229fd
font_01_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 17184 bytes
SHA-256: 86c2efe9601ff99bc53173992129494ccda963c415a86c682ec2558f2f66b0a7
font_02_sfnt_off00014b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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