Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82756aef094e2ab…

MALICIOUS

PDF

90.8 KB Created: 2021-09-06 09:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9eb278ffacfc7feed0d49d23e7e68561 SHA-1: 2f04bba7c3eb988d3ffebbb176484c48c14d4cfb SHA-256: c82756aef094e2ab6e46c96a25ebf76fbc32f281739332b8c152ed6843420807
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=probability+statistics+and+queuing+theory+pdf+download PDF link annotation
    • http://studiofapas.it/userfiles/files/dinozememujalepowamuwenud.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/pidasowisijidoto.pdfIn PDF document text
    • https://emenu.hu/editor_up/56989477481.pdfIn PDF document text
    • http://cloverdiamond.com/file/59046679886.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0d377e168ff5a9d595e80fd65a8f38f2/jopozirelisup.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80341924a---voratosalapiga.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3cinbb3corhorfup59fc7lpif6/gufegawiramuperedu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/raxezolumoxaganelava.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/peloratuxotifapupiz.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/gozapogoleki.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/51822110426.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c228e1c68d3---ritelezatomapozawa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbac970987---9436201919.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mewadekofa.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/eemgic9585s90ss4960j5adp4u/dusizejajulasufaxi.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/denefozenaxofuwukasimi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/enotumasubudedebufuxol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2fea2000---66045186596.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/58993577594.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6h1ci6nt2141cpk6ld6j90l2sv/wamadevuwojokuretonuvogi.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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 19120 bytes
SHA-256: b3bd7c2f0df763c4e8f9c38f2dafa4440e01654b15f52f0186639a3bab95a4ce
font_01_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001410d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 11484 bytes
SHA-256: 9e72268ab1c33834c211c9d3ca45d5af28ad57e842d622327a12ce1e52cf377b

Open this report in the interactive analyzer, or submit your own file for analysis.