Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ba70917f357cc1…

MALICIOUS

PDF

73.4 KB Created: 2021-10-01 06:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8c3bdf5a942824d7dfe67a8b8680c488 SHA-1: 69e611b7daba536a3b4aef4c6ed6ed615e956daa SHA-256: c8ba70917f357cc16bd63871d634d312b3e674ab9ac1eac7009c6f4ce4af7044
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs and PDF facts suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=start+with+p+and+end+with+e PDF link annotation
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/39816020763.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/rufagupe.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/xidupoguwoxovagubix.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/gigobivurelar.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/ziwiwojixepikivesufoz.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kazawewonazepabebaru.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/97998803035.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/denufidiwubuvom.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/98435226614.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/70196828844.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pomalopimewobafe.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/memenevikukixivevisupin.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/d6gm9c5ciehcjr7k51qqlps582/24384237706.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/novibilirodenakogeze.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xekaxilelikepanivudaj.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/lemigoro.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210923232201.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/japutebugowifo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1lbheq1u1iffbh36qvu532hrq4/96807427692.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/ledibefenaxokoweg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146abd0ab789---44390557689.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/rudufotanomisisidotenona.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/10986779155.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kujukir.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/vumovulilujakef.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_off0000b7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AC 10316 bytes
SHA-256: 403a0c6f2cc49189f8d3f303f4ec260e0e66495406d22eef4fe61a41b0eb33e8
font_01_sfnt_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 19132 bytes
SHA-256: 6f58792d13ed57f4ad00922534ab00359a06987547537e467e1c00a21960c31c

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