Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aec6962ffef7cc…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 11:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e3bd4f04f9a5d151fa87f82228d9086 SHA-1: 3947273d613951415e0020637d21d38288a5b022 SHA-256: c1aec6962ffef7ccaff0de758e2fbadc1849e4a6ef2d952cf54a374094adaf55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The presence of these links and the overall detection indicate a likely attempt to lure users into a compromised environment or to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=delayed+clotting+of+blood PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c2606090e23c23576d9523a536f75d49/sufegojuxidafunuk.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9404d3f3a106e93e0e126e7a1b687dab/geribufibidonudut.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61671664e---72572490471.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/nokipidorob.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2264a3d75---35701891614.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/kmf82ns3e3ib980fbm2nf7s945/pukokuvoduxixuwago.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/62bbe57f2db7b8ffb5e1348a0a2ad978/xuredox.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1e57e62ad65ab2e73f5313e6eff39e6c/sijuj.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/gipatuvesaximifog.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/870405a6260570de1b6197f85146d845/funazebuxegavizogobiku.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/luxitufikewokoxelod.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fvfo32q9bv2rui4g7t2n61k99o/tilobodegetefusanuva.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/639c57b48ab07fb0f8b5fda6d2900117/9589631111.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/54475805761.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d7b8a18b---pumeladilegepetutokixoj.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kejabevonesotidopagajum.pdfIn PDF document text
    • https://majubesar.org/contents//files/fabopazovuduge.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/503511ad12061ab0cd2c3bacfe02fc21/73582032935.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bbe35e54---xumomolapifola.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc29373f5e---59297444918.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfae80e65d---wafize.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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 10640 bytes
SHA-256: 36aa72fb106d67cefc89123908f6b16b458848606284406fae52ed3611e95706
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 16656 bytes
SHA-256: 2d975cff34d38ca58f2a98b3112112bea6acc507966305df9c12fdb721b8c09e

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