Malicious PDF — malware analysis report

Static analysis result for SHA-256 6087c530679b0326…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 18:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88477cc683f04fe0723ea7947015fa05 SHA-1: 55c33c5b7e694984df3990bf16a233d240384acf SHA-256: 6087c530679b0326c3ecd5321a6a4b43f96d7aea5de2fa80c50e4cc1ecbb6430
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, likely intended to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hotelbellevuepalermo.com/userfiles/files/jexijipevajidofokukav.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/jigulavebifukegeduzovi.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/95288089721.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/71111846690.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/eb9888678c21d6d10586334ed9e3ad6f/jusabasofak.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/37106237814.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8365858d0e7e5367f51c7ab251c193f4/pituza.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aec860e54baa6e13e2da47353871f58f/86185445212.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/58831838168.pdfIn PDF document text
    • https://ekransamara.ru/files/ripabibejozifasuxix.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613276a8c6f97---dokolavekuwezuxejabaxawix.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/figumasavuboz.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/52943198560.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/liniketajukituzax.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/99854919143.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/74702500792.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/nititi.pdfIn PDF document text
    • https://techlan.pl/files/file/27818639083.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1367429f7---79837561555.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/43989961223.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/tebiwolujopapeg.pdfIn PDF document text
    • https://path.mn/userfiles/files/71227691399.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/jutine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fluid+mechanics+kundu+6th+edition+pdfPDF 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_off0000ba7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 17372 bytes
SHA-256: 0e7e4983e5a179357c779155d077c044235452f83ee81608972bd167674fadf0
font_02_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 11124 bytes
SHA-256: 83d1959eb57947f9914f795b20054b8903c323350291f37ef9e7d9d8519cd194

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