Malicious PDF — malware analysis report

Static analysis result for SHA-256 882adf070337d2b2…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ff6530755dcafaf6ace74b7aeb1b8ca3 SHA-1: 4cfadabdee74c3a5cb810b99c109ee799a1391f7 SHA-256: 882adf070337d2b26b36c6b954c36ad413746cdfb2698cd6804c2ab975033c30
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, distributing links to various external sites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://silky.ae/images/bulk_images/files/22380492797.pdf In PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/xilakaxaparijoxonejav.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/repasezigexewugumiguvovad.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/72968745420.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/parutonewesagej.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/71702005995.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/24504514043.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/09aed8755dd1649ad231c1d76ac96c3d/9854925792.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/zizimejeguzibopaxufiv.pdfIn PDF document text
    • http://nineslash.com/user_file/file/kisogugam.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/rolunidagibonalalukove.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/141728439329.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cea8877b2---buvavigizoda.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/doxejigepiv.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092103041333.pdfIn PDF document text
    • https://digireg.dk/upload/jadesizugojikenax.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/60877002097.pdfIn PDF document text
    • https://armenia4d.com/contents/files/winibiwa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0260ee7cd---waxen.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/95393104438.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/bolupofivir.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/kunomexijekakegikawozi.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/zogufirawokaxufab.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/49173228624.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipozapopuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+media+player+apkPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 16716 bytes
SHA-256: 2c3e1db8979ab2967dc56341a873acae808183fbba98830f40585a9bc8b95ac9
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10312 bytes
SHA-256: 1007d61f89d064e594f679e053027eddf77326a468be247369bcb9dbc81919a2

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