Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bec711f286edb8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 05:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb5b0474436fa805f4d26e8c024bc0d3 SHA-1: 98d2bcafa11bdbf4c04fec0facd37c4cc773f5e4 SHA-256: 58bec711f286edb8f3ad3b173c7c8fff88063c1d514b70318f2bf3712bc8ac6e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or SEO-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_20_13_22_2790.pdf In PDF document text
    • http://lavalnerina.it/userfiles/file/52883117478.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wefikalanet.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5dv518r776jnad56iogufteum0/2525819443.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/11153584884.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/572cfa708974f4870a7af0874cc5ec90/88232362928.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/fotibamisusotazegaz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf09c8b7f---13222973150.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393372e6b50---6375046262.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9eb6c98c78a86c9ef74d1a799026f089/12344390462.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb85d65f3---pubanobamezujuvorugataza.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kiropipafok.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/lusidavudixipulekozeribi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/76709673300.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109030145579495.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352194edb1e---polejavifogupusedivoxefap.pdfIn PDF document text
    • http://vpsystem.com/files/fck/35931092325.pdfIn PDF document text
    • https://cmf8.ir/data/file/fozixukexepuvukasoju.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/gaduzerelawipogone.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/72541896425.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/71277208940.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/34dcf2344bcf0a588c0b72b233b4649d/gapewulujirorun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=libro+de+los+4+acuerdos+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_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 19984 bytes
SHA-256: 52b6825df862fd85c7b8fcf955ffb62d90d9a01da56b5d637352a3dfb6bd5c6c
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 10684 bytes
SHA-256: a93702573e9b0075e40934eee7b099ce07b2c271c94193358b20a48e3e1552cf

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