Malicious PDF — malware analysis report

Static analysis result for SHA-256 8021fa44ec19a857…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 01:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 860bcb9a79e46b91671a8b4f0b10c658 SHA-1: fb7db4997dac1dc8fc1bae280db09784c95d595d SHA-256: 8021fa44ec19a85717bdd06036821034e6a79bec015d54b636f168d3028d919e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=network+cell+info+lite+download PDF link annotation
    • http://pronobile.de/catalog/file/xoluvimepuwawevomode.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/722794583.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091419032173.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090519533696002.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/xibegenixolomitufejotobur.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/66533951718.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614120cdbe62e---vifadewexezekixuwavir.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/guriginijasoxisu.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/35403784555.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17d606b95---wijexe.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/dujalogazavuve.pdfIn PDF document text
    • http://peoplefoster.com/pliki/62996180788.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/tuvusologenu.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/gurimazoviseripoxow.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/weramubepotuwujonesepo.pdfIn PDF document text
    • http://industrialdevices.in/uploads/padananazovirisojobijunob.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/gefudowexarixo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141126e80a79---54045301612.pdfIn PDF document text
    • http://identik.hu/editor_up/kuvapav.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e76c2dbad---46728054150.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/5612230930.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/39358721232.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ece99589974e8ee7149806ff8fc5bf05/dizafafefazib.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01fdad4d2---44376616365.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fb4a0924271d431f16d9f814e970f497/69968205215.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_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 17344 bytes
SHA-256: b126a69a318f509f1b097a9202ac6d480434989872eb5b49026c630efee83cb3
font_02_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 10456 bytes
SHA-256: ad919f66689363199c859037f6861904e1aabc2161556cba028e2e3faa40e830