Malicious PDF — malware analysis report

Static analysis result for SHA-256 58549a517016ea94…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 05:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e5968e9e8d588ab340e756545e24139e SHA-1: bf06324f5a390ab5610e078f8b0f6d4e6bfe6952 SHA-256: 58549a517016ea940515ce3e6346d8835a555e85493e9320672bb2eca7065cf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a likely spearphishing attachment, aiming to lead victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://garglob.ru/uplcv?utm_term=sentence+with+demography PDF link annotation
    • http://madiagranitosilano.it/userfiles/files/timagosusavefife.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f590f6983c---kuxipemiwowixilew.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/vimiwarulavopag.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/vovajefowunugekas.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f2f0a944---34693683746.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210803_7BB01555EEE1496F.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/0306440ecc638e619a00d48c2a56d7d8/pinuxorokadi.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088d794bbda4---49398351250.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/4781478167.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c256fb85b32---duwipen.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/nefusoderufo.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/kowavolavosabaxebagajoba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce585caeb---zukulotogagoxuruwokex.pdfIn PDF document text
    • https://kawanmto.com/contents//files/67363034163.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jb0minvtkmgtaqq7u1cjpag394/25959610347.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/kexuxawogaju.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a689eb69---bazisopapupo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/da18c33d0f59cc04bdad368e39d700d5/leripojizebedogaveso.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/49384769855.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/57825597914.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/jugilepulusomigivisaru.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e690ac6c5ed---7358063734.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 16160 bytes
SHA-256: 0de48d09b0091e2dcca1524f119562a2650f4f0070c1ddb91a42211a810a88bd
font_01_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 11024 bytes
SHA-256: 2bf734b1443da82a28885c20a343629b7c81491e78ede4864affb0733b2a5886
font_02_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 15568 bytes
SHA-256: e1bee1755be656a4bc08f9fa3f4158788ac7654bdd72c71665f4722e6f0521c4
font_03_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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