Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c832afdac2d73b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 05:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d62251e85e051686ec72d7f96a6d47ef SHA-1: 7859490ea0fb07582d2b052a0fe30dcf2550a2e1 SHA-256: 02c832afdac2d73ba0902bf3bd08df3e67c27334aa18e093aafd2fb74928100c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e07a6a6ec---7077181943.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/11317222772.pdfIn PDF document text
    • http://dytac.hk/userfiles/28061457224.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17b6d62e5---64287549468.pdfIn PDF document text
    • https://bselink.com/userfiles/file/13420934046.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/44257925203.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/wojepipokuvivusi.pdfIn PDF document text
    • https://sim2007.com/files/32101264577.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/17898764213.pdfIn PDF document text
    • http://opsir.eu/files/file/22073725769.pdfIn PDF document text
    • http://ellev.fr/upload/files/naxubajipozokiw.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/92762012886.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/wutufogixoluzufaxuri.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/24494365440.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2f12ee8d---44441613105.pdfIn PDF document text
    • https://trexanh.net/upload/files/lumixukemapa.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/97440068580.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/21457954144.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/nubusumegagodar.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/dozigeji.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/24586628831.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/woloxoribumefawoxaxowibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+a11+chipPDF 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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 17684 bytes
SHA-256: 553168b39d31c7bcb89a2562391dba719b25127d1f07aa277021294f48269165
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 10812 bytes
SHA-256: cbbfc1650bd3620baf299bb8f74547c54ea98a14ed90485a8953705dee6a6504