Malicious PDF — malware analysis report

Static analysis result for SHA-256 491de1e535eab5e2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 68158639038577ff2a4438e08e968bb0 SHA-1: 2417f0e39fbf89720d24a6948c7ed4f38e2e1fec SHA-256: 491de1e535eab5e2cc5866fb828196f8a5f8e70d10d3a1fd41ec13dc3f7e6c0b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nhuaduongnhapkhauaz.info/upload/files/jerizitutavufiruziji.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f191dc38e---40293777673.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4tvv0t6fkc7cbk4goiisl56utc/fafopi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73fe439107d3db82b9f4ee65c5f04e13/34029594153.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/47247134179.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b153e606c---melikag.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/64231614004.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/mimijirekezexoki.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pilabexekuwiki.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/rixototapa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3a82cf1cb086b63826d5e23056f52b9c/tofekibazamarinorap.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/61821195079.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b57af9f1738---garusevodonududotonera.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/58905770017.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d966ab0a21ed84c0d75cd4499675112e/56062518864.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9il985i0jujr1451milfct6ua9/75182018754.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/ferilalubegorejodogumuse.pdfIn PDF document text
    • http://bociany.sk/media/file/49195335276.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/2099684963610d34c999d0e.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160707c9971229---25941015035.pdfIn PDF document text
    • http://jarosi.hu/files/file/52338855897.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/fizavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=spring+steel+stress+strain+curvePDF 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 10672 bytes
SHA-256: f4a01a69bcee7da12ff13d1e6f46b56c9f2a4ada6d0d2718ff3caab4afbe9f09
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 18792 bytes
SHA-256: 3671036afc54ea80e8bd26b50f5a7cde479eff792e6f8a70c2760d2e0f4f9433

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