Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4c4c24c95eba67…

MALICIOUS

PDF

93.1 KB Created: 2021-09-20 03:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: febfc430f54165cdc83edf8a8776d9a3 SHA-1: abbc258c41be632c0f85b80a7c0068eb3a7bdd6e SHA-256: 6f4c4c24c95eba67dda159aaf7a21f4c7098a15dfcaa9c2fd5f9565a6082435d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=123movies+monday+2021 PDF link annotation
    • https://avukatwebsitesi.kocgrafik.net/upload/files/20666548167.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66922832420.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/01626866c7f3ee8a5806231f7b4f3414/kasawebopasulakelan.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/87560091968.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/vigeludedep.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/pefizineketonezawijoliwo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/gukemuzo.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/9906862260.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/prva1glr2ftt7jsb7850dhicu5/42291546125.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/68090447059.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/pukodifagozigur.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/26024607342.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/11279912584.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4e772935---38599123592.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9115115904.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/jadun.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/31658486710.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/57653272418.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/59526053461435273bcddc.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/siwebumogigagejovel.pdfIn PDF document text
    • http://apex-architect.ru/images/file/9521645747.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210918210910100.pdfIn PDF document text
    • http://poliinc.com/upload/files/28259421855.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_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 19524 bytes
SHA-256: dac59b57e8d52e56bf9e41f24c34340328fdcf9581ea0cfc504882469c1cec32
font_02_sfnt_off00014ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC9 10716 bytes
SHA-256: f04719f727f04f85646410de99c47e7585cf76eb911638ce1017feacb0338470