Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f8c1699b1e168b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 23:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d07e04810380a08282b402fbca6c720 SHA-1: 333502b6fe759642a3323f33cf4ead940223298a SHA-256: 10f8c1699b1e168b0283e74df32e10f1b42f67f2da84071a75d7a4fdfb9773bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure of the PDF and its embedded links are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=icai+ca+final+books+pdf PDF link annotation
    • http://esistore.de/userfiles/file/nubitenijizefazuvosobek.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/kerajunabasudazarabubox.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/21172344650.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gofojuvefagomekixizi.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/bokezoluxuwebedinosofijiz.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab39b0b5ab---kijisizamivuxeselipigitos.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/devidu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/359011178cb42c5bab2494f3eb2c86bd/pasebixebarapozozebifezi.pdfIn PDF document text
    • https://amgaa.org/temp//files/tudefo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826f624b6bc---bixuveradugaki.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15fb58e07---jepujewofab.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebb28313a---12808017142.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uk3rflfb12654mdialh9073dft/9310853823.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wakepedirere.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/1417843417.pdfIn PDF document text
    • https://hoalavender.net/upload/files/rerumasomifowakugikev.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/hg1drk7ahkpoctkdo6opdrpiqj/98426251542.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wimisovili.pdfIn PDF document text
    • http://talleresjpg.es/img/file/totokir.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6027e83f15a9ff0ba1190b156686344e/59492181948.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/repovukabufigukidit.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/dopv2dg0dc82e3a60o25lmbi5g/niraxabejejovuso.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3076ff8f---10541978361.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/lejusup.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf5d405242fff9aad5cfe8f296f047ea/71432433857.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/papojupu.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 17632 bytes
SHA-256: 292756135eb5bbe2ddca5c6d429781a6032401cbaf8b2ea6a951f413d5f1e66e
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 10464 bytes
SHA-256: 034fae2707d4307f1b5b8542b9839c93b93179f3049111a08f6ec2920fe92d03

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