Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8aad6778d9361…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36d6b0be0d59a9f8f1de7740eae0bec6 SHA-1: 69f4083c11b26180689717868dca7f47c3204e7d SHA-256: ecb8aad6778d9361ffbdcfc9ecebdf57f9ac18b80f789cd0682eeace9d80cd0b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://upoart.com/ckfinder/userfiles/files/lilizosirinupisopaguw.pdf In PDF document text
    • http://tw-sincere.com/upfiles/editor/files/soledavupedoxenalotoro.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/bupamakovofirixig.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/zezimawokixoxuzetomuvoje.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/rapomepirovuwalofamali.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/30583768933.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/zofamusefara.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/85626925548.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608932b70ee5f---vamevelekotakegaxug.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607213356c5b9---vexuvibimasininedujimug.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0bd9e61f---45380359655.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/bosex.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c52758ed04---sevevogidexuxakejeninarur.pdfIn PDF document text
    • http://headrepublic.pl/images/files/67299097129.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094818561d28---40599777396.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/xuwuwitapofug.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/35416220965.pdfIn PDF document text
    • http://efrex.cz/files/file/dulanosudolubemukefurapok.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17267113913.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/91785602493.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2a51d9c0---bitufubekelusuwapigemur.pdfIn PDF document text
    • http://rrarental.org/upload/file/bazarinajevotaselof.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160899b5f6d983---gopugebajebiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=personality+test+with+answers+key+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 18936 bytes
SHA-256: d510c2b8151be27ba9bee451deb347e5bc4b591e338ae630a73814963541944a
font_01_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 10888 bytes
SHA-256: 2375bc0bcb380dfa4920c966aad2d219ce7254192824ccd26699a6eb2b62ce61

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