Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e14b9118e24f3c…

MALICIOUS

PDF

134.3 KB Created: 2021-06-25 12:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a9751cc3814d3847d1bb30c6466bcbbe SHA-1: 5c63d2c8fc790013fc154d274cec08a3321a513f SHA-256: f0e14b9118e24f3c655f1cd962d7c297950a0dd96cc67e66761525938f6ccd2f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/j3avn493vifgpb18qn126voish/996036754.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/776c8a5c1c61f96398a42380df9b2810/5948963041.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097393fdccb8---84453011306.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qfelrlm0mc0gtc31gr67kr9f18/48101817526.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/63756758849.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad508cda0---gaviwuk.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/r9i66co5eqe5a9sala2m8b7850/besidiroxodex.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/81e7208ecc0769f703c18ca05d334241/gagip.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/51072329871.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/muriturexuj.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c1772a6f---56739808076.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083196ebb7b3---ruzororom.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sanonanawedaleluxizim.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/dizojeromi.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/gudatitedemagalaganugogup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=buddha+gatha+sinhalaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001974e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974E 5412 bytes
SHA-256: 0022d6a0dbdb969c8ae6a802c33c038fe7c11d9d7b8275b9f6bd908d6fbf4d71
font_01_sfnt_off0001aa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA6D 10328 bytes
SHA-256: 8719265860ace3272522af0168ac9919bf729c0219aa670865e5b3af6217c58c
font_02_sfnt_off0001c16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C16B 20444 bytes
SHA-256: 5e3dbef5c50b7beb55606df8d746d5e989b20233111ad34ff2945d1e2ee57c00
font_03_sfnt_off0001f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1