Malicious PDF — malware analysis report

Static analysis result for SHA-256 0607f2156fffcebb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 21:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 559e19a1414d7e9220672d6149c88477 SHA-1: 3a237164c8e5f521e6a2d6f2437906a39a9ade24 SHA-256: 0607f2156fffcebb69a3cc4ec6627ce13affe13d7bd20df4e6df0d4e559b0826
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links indicates an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://synerhu.ru/uplcv?utm_term=whirlpool+washer+manual+diagnostic+test+mode PDF link annotation
    • https://etonbio.com/newsLetters/images/file/72067343285.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbaf72ac9---zinekedavokob.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c50b89c1c71c866c3ebf785905af8ca8/fuvenik.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747a8101560---16917752580.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/61535468110.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91914dd33---34837949276.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/26725093362.pdfIn PDF document text
    • https://tsolisp.com/files/file/83852837014.pdfIn PDF document text
    • http://entrackintl.com/uploads/27810562233.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/wogogovunu.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/kavelanikorabibe.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d58f154snecdbb2d6lcj4ugkr6/45739562753.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80fd250c57---92167792780.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/refuvolefonepodegir.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c07a8350c70---94868558051.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86f78ebf47df530dd674c2060fcb3a3a/nuwugolomimetebiku.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/worudisabobevutobax.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/46567439546.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272ac412451---zamiwijiguxamawuvim.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nipivuvosamudawarorofuf.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/murewitalog.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0241c8c09---69566942631.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/kugijalesokela.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/33068032741.pdfIn PDF document text
    • http://kmsenior.org/file/files/81741649874.pdfIn PDF document text
    • http://sam-global.ch/files/file/fidugadetov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 18212 bytes
SHA-256: c534570648cafa7e413cb63268eda180534b1d073918556702296fb2b9c676e5
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 11140 bytes
SHA-256: 902f242415a1ba4b881fc2922ce61aa2b5d97afe1ded124990ebf1959d5bd31d

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