Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e889d83e769b91…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 14:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3baf3d65d17358d4c28cdb0bc43b569 SHA-1: 600228b3b1c86ee81ec2cfdcc35f16600dbcbf62 SHA-256: a4e889d83e769b915de2364dac282619e79b0c066a970fb79634c33418b35b44
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://nandishoverseas.com/UserFiles/File/19582084779.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/71679492206.pdfIn PDF document text
    • http://iucecb.com/files/file/3149057353.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210923_C08F4B710B959AF3.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/79838308800.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/rapovunopazivudupo.pdfIn PDF document text
    • http://techmechengineers.com/uploads/mivubijag.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/xoxebibaluxovupofuduvug.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipijevavi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9be84f3bb---putivivatukati.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/68587423711.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131d43f07a3f---medowugidulexujefozuman.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/830089475.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/86576001908.pdfIn PDF document text
    • https://citrasas.com/userfiles/file/81218407063.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/rolibonofemozu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/vipapopatojebedekixamat.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/sowejuguzerelew.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/dekukunolivos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137350198a1a---97855959272.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nepawopiburetulunoxija.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/32701733849.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/zoxuzaluwuva.pdfIn PDF document text
    • http://terminsk.by/pics/files/97321837984.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/lifojenifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=conda+env+newPDF 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_off0000b180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 9920 bytes
SHA-256: 8d2883603db0759c1ba7ce98e3a3a6d44ef41a945fc7e6b52d2f7c98f7b2207d
font_01_sfnt_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 15540 bytes
SHA-256: 6f6e751e8e3397dc648c3a156249a363d9103a09a1f7d8ff8e92dc42d1c6c8f5

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