Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffc155d2ecac942…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 12:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4397338d067d062bb35d715c705ef88 SHA-1: 486f541641d4fa2535cd75451c2d6e966ddbaf36 SHA-256: 9ffc155d2ecac942f6aaa0e5fe2798d6ed62176e406aa949ad9acde96500c30a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the presence of embedded JS and the nature of the URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acryl-bg.com/userfiles/file/51481125714.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dafa1cc5e34233d8e7951a92eb20822f/44717673632.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pkvrap3a2s2nn3llvg75v1dnhb/nofijawaseregus.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/25913455454.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/fobaxal.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/bavojoxejonetu.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pinawapisorujezuj.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607724e81ae65---sonovoz.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63011040149.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/91871189406.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/53366405495.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc7a2e83a---kelif.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c22a000254a---61436929708.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608597d4d6058---kafuwewu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35426ea10---juwedebakiwuxixo.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/goguwowoxotijanigolu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41201007a---dobenife.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/18951661394.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/61201214974.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/jupesugurotemobu.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tifebut.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/422124613fe3aabb495bf0ee09e3630f/xotanejulusi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/40478869640.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/zasiwatixopofigopusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=example+of+constructor+overloading+in+javaPDF 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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 17668 bytes
SHA-256: 4d64b166feba1b12ddb233925026ca6bd5280cb6ff4173922c6abfd30dd7cc15
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 11344 bytes
SHA-256: c52cfffb072cfe8a56407bfd630468561f242d3a49a3effd7c2682d0583be0e7
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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