Malicious PDF — malware analysis report

Static analysis result for SHA-256 44050e00981dffbf…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 19:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec82bff3a1899a9a1060c7a15ffcab68 SHA-1: 51b93b4fb13fc39428f54453a2756c11a8272805 SHA-256: 44050e00981dffbf678c0241d3559a109eed3d7ee316fc5965855c97811a3d1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=to+bound+meaning PDF link annotation
    • http://salt17.com/userfiles/files/zikizopotedajinuwesoluta.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c2b4fe3bee2d3e7d48a92f90a23ddcb/detajora.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/43216677224.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/80032771387.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/35987138515.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f16cf0465---52551698587.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/gerexufufixil.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7e260f0b0b6c6e432f5d8a2d2c1d6b41/vunapabugiliberawaduragam.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/gotubaji.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e627160288f---bazowexofeligude.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2f5e7043---26862867018.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc664c1cc3---82584375489.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/j99q40htjfs30nu1ni02i5ecrb/96988893712.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/tijikeluguj.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfea69d73---36441314036.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/tawudigesekedizogota.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/44333079417.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d805d52e9ee---badujapatukotim.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/widexudifidarowejajuf.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/sutekapedilagejepa.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3f257acdd9a6d47383484c40349e3ea3/85615167819.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/92bebc2a086905b5fd356533bee7f1a2/11356651864.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_off0000c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 10380 bytes
SHA-256: 97339cee92057300e0d4f17a6979eb42b58c6df5e0751920a07a7233ea7750e2
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18304 bytes
SHA-256: 404f99100d04068a75be4c7ed172819cb69b3fa767e6d565f1c918ad2cb55dcb

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