Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf5299fd67654ab…

MALICIOUS

PDF

84.7 KB Created: 2021-10-06 13:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b03017d2f258b39a09e78d8ae209666e SHA-1: 49799ef6f3975385ca396bd837af37270fdd266f SHA-256: 6cf5299fd67654abf635e4f98ee4bdece9a5be26e736e863b10880c2d9b7da8a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://masterkontroll.hu/ckfinder/userfiles/files/bazikaginusakanufizedig.pdf In PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/kiwinemiwotozodalodevudid.pdfIn PDF document text
    • http://idcla.net/upload/files/posimabawewerujofapasi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/7119240935.pdfIn PDF document text
    • http://hiniceshine.com/upload/junonoxojuribejutino.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/tixovomizoragad.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vesatubabusotapadobab.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/82362443727.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/44468522616.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/bovojoreribejupedisesediw.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e344aaee6---33329079966.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/33287861173.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/onf2avk496thmp31k5j0714b35/soxufovewe.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/limuw.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/xogapamigosujuduro.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/kurizanuvemutib.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tepenodadajotikagazixat.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xukazajigosajokuworoza.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/pakagakiruxevegasowu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d15ec6a2bbdd375e5d4a7216d6c4219e/88156699157.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/89470966032.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/65911177105.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vefuxomodeji.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/6506143687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tension+causes+acidityPDF 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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 17612 bytes
SHA-256: 94207bc2d82a2e730ab8c7bd5bfd493df4efbc7377ac83e7753d21a3cfcfab2e
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 10396 bytes
SHA-256: 028f2729a0cfc7c1fa6e172d08a62a0d2d238805c2d8836efa5cf9bcc59c42b0