Malicious PDF — malware analysis report

Static analysis result for SHA-256 0416fe8174f72a0a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 06:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d31fb01d36a6f5c0bef0ac57ecedc661 SHA-1: e2a333d95711b92ed2fe3ce4e3400d140e8b752d SHA-256: 0416fe8174f72a0a3cec1503a8cb72ca505bfb999bb67825e16ff978cf84a16e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, forming a link farm. These links likely serve as a lure to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rauvuonsach.com/images/uploads/files/muxudebebakedogutomev.pdf In PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/38344976577.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/kuwimukewewudovosesobif.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/99054533949.pdfIn PDF document text
    • https://ivanamihic.com//files/41818572210.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869dbba1103---54505823382.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/57624677474.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a36987a---pixewotegubovevul.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/wosewogudaz.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210904_084650.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9djuh5qj7727q1i0ip3ntneqcp/17748633633.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821d620a32a---tenewotumewivadajore.pdfPDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c182c7b20f8---fasedegugizewi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c9e51be7---vulatigajelar.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cafe642c4---46795848343.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/jusekufogexolawera.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/xavus.pdfIn PDF document text
    • http://18554080.com/userfiles/file/kiwul.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/33298571505.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609632caa9758---47713321370.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/19025100329.pdfIn PDF document text
    • https://kopari.hu/files/file/13336976235.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a3db986c---87440373718.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/dikibuxidiwuxenof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=aium+fetal+echo+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_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 10596 bytes
SHA-256: 1dd6598702611b268f70d3b19e09d1f54fe3f0de470d1a46c3f867e37b8a74de
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 17248 bytes
SHA-256: 4031a7a417b0f592d6bb9d94349f4ef49570527e95d261e2b3a8ed02b49ed449
font_02_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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