Malicious PDF — malware analysis report

Static analysis result for SHA-256 54adc04bec4310e3…

MALICIOUS

PDF

109.2 KB Created: 2021-08-21 15:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cee15444be382b0edc8df3d5069905eb SHA-1: fbdc327a4db2bdc8990ced483fbf3731d738b994 SHA-256: 54adc04bec4310e3a92aca4702312f4d6d9afeac12dea6dc6d7dbd5a0563f6b9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This behavior is indicative of SEO manipulation or a phishing campaign aiming to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://duetsepolno.pl/userfiles/file/18216967146.pdf In PDF document text
    • http://186086.com/upload/files/solafota.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9301b20bb---74905064534.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/97242451899.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/legigadat.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ef2ee9cf6fb9fa9a13d7c07602b00860/samepojusipinadikaju.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/094db46fb2133e896b248ad941a29ea1/23463905029.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/faxokipofivusafijelemebu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ffa3c0c8bae148ac314f057fb6bc38ec/15083289437.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/1f99411e5e1dc1231ce1c8b29b66aac7/84645132880.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d13b1bd0f---1810073282.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50516429800.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0e3c64570594447c092694d4b19cc0dc/12220404880.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/zekisobitatixaxole.pdfIn PDF document text
    • https://baptistfriends.org/media/4783298346.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc25581a96---62394612219.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/xovabanusubebuzenare.pdfIn PDF document text
    • http://dogable.de/userfiles/file/rigubusabipidado.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/26675338581.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/38847191536.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vazuxupij.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/5652281185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=%D8%AE%D8%B1%DB%8C%D8%AF+%DA%A9%D8%AA%D8%A7%D8%A8+ielts+band+9+vocab+secretsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013a8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A8E 30208 bytes
SHA-256: 2c825c985551fc04f554f2ca4612019e86bb42ecd8966d33cbb24cf8e83fc6f2
font_00_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 15968 bytes
SHA-256: b652dba1cab56be1b19feb77c806c9c8924a5fb9dbc7a4ac2757fcbe2490e59b
font_02_sfnt_off00017034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17034 17588 bytes
SHA-256: 8ea3a7240a966de0f4fb3d89bdb7b99ecd948ecb08ee77f9665c2e7dbd890314
font_03_sfnt_off00018b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B56 10640 bytes
SHA-256: 4209dda41ebeb74433c55a960f83ee4df499a2460b8f227d53d605f0e239bb4c