Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0412afe03c589d5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 20:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f4bbc3a0ee4072e41d6149a2fb5c67b SHA-1: a49b67019f427e40ef77e06ab635f705069f789a SHA-256: f0412afe03c589d5507ad377142205508c7aebf44894ac7d4e77f3ddabb37001
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=free+notre+dame+wallpaper+for+android PDF link annotation
    • http://lsmtrontractor.com/upfiles/file/20210920082310.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210918_DC3CCD878ABFA9ED.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/24132771936.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/kegati.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/riburunumulemirim.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/69746024169.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/veniguvodovemusigituta.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fimivaboporilemapem.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t39787mnv6r1bvgqe0grjdqpo0/42059236332.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/juzifovumubulujuwuxages.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/41370146788.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5aa22f14---tumijape.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/watuvegoteli.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/02a545146f656360db812625e4cf6dde/lelopewuputafexunos.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wimukakimujelok.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/32793650722.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/somafukevapewamowotag.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ee15d8b4cd118ff993289c54e27554a/nuruwoduparumixoba.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/vifebavinuf.pdfIn PDF document text
    • http://hanleyresources.com/images/82086482028.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/45396323052.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/58226459222.pdfIn PDF document text
    • http://finchamauto.com/pics/58761030202.pdfIn PDF document text
    • https://suruburi.net/mm/file/93085300992.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xamimuz.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_off0000b78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 18336 bytes
SHA-256: 344bc673bf47d1a3553ade825dce90984441b6ca10063744bec508a8f5b43db2
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10556 bytes
SHA-256: 6436526e47e83d8707644abe32d479b628028c95dc24c733e4b839a13d4cf435
font_02_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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