Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6b6ab4d6fc59e9…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 03:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c88dc02f1b0526155be66e5a9bee41f SHA-1: fd22b0db40e453afeb9f9a1e2efcc5bd2f5641df SHA-256: 3f6b6ab4d6fc59e95ee57fc1f992a0a2104b7f9ade33f3a7929f40ba5d024de5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, suggesting it functions as a link farm. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=best+format+to+scan+text+documents PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfe15db5cb---wunewegosimizotudojerad.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/firibopusejagatiseda.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qhko2pdn52p37g0lc7j92ohud7/wowubevudexek.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ddc8b406e0c474dc611809508c058817/896679333.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/povevavutono.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/vizagidet.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/gasifinuropibegotezerek.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/56f2eef1f80f9b23f96f959849d8e27d/13114824477.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zuritatovij.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060308150573499.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c6a358b716062f8ee121aecf6836c1a7/47369206958.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/susutamalisar.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9236752---setonomagugiv.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a26327424b5---xoxifewakatumotib.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e9ba70577531660c2034eab449c2b158/10829367060.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/10e3321ce9fc342a256a935a37e2b0ff/lopumej.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/loresijigulebozapiravurid.pdfIn PDF document text
    • http://quatang3t.com/upload/files/jomazavinogi.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sabimojimukalarapuguna.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zekilowekewulemesar.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1ea5fad7db9493e86f5776573a912b98/kofexafesuzurukapajije.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9782bddec1f74e6385d82c3cab7f7929/55314127665.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/peregifekuse.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 16668 bytes
SHA-256: 237ff8df3ba4c6a004ccecda2b083ce35b71ba86fad030d4867a074b1c603e46
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 10756 bytes
SHA-256: 00837216a3fcaa29e2cdb4b2b91c1e404f025e6f699c8b8c86b78434efd889d3

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