Malicious PDF — malware analysis report

Static analysis result for SHA-256 02df82ce78de6a65…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 20:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6d41412f748df8e31469ba28fb48c98 SHA-1: cc501ac5a94fa5c71f6e9e83d651191c683fa399 SHA-256: 02df82ce78de6a6589f87bf1d8539bf76f4d0d525aee358f5ce4dc571598a185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://hsse.cl/files/49649858663.pdf In PDF document text
    • http://marketypik.pl/zdjecia/fck/file/bigadopaxudujep.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/21139500893.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xigutemusemugujirumep.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/15624844123.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/48224258113.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/1261353518.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/14001316316.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4023589e00e55c8cf617368632ae5a8a/pixug.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/44820233046.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gezefu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ed2d4120364faac34f7b4b435b25b59d/vawesemoze.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kolotapoxekalojogogap.pdfIn PDF document text
    • http://canadianrockies.info/files/file/xamosevomugol.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/he30jspfjf5vapiovj56qganmj/zufunoxinapozima.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613327cd31821---nevefo.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/20743162221.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jiges.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/kirevosuvi.pdfIn PDF document text
    • https://cicimanis.com/contents/files/26466655510.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/45384142986.pdfIn PDF document text
    • https://birudongker.com/contents/files/44717414410.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/fusigefediburelive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pk+xd+new+update+2020PDF 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
font_00_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 3780 bytes
SHA-256: 0791c1e10c4477fcd8d18d2754e1bec27b1438ce7db6323b970756070f3924c0
font_02_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 10480 bytes
SHA-256: 39066841abb5c2efb1103eec3827e9e06ef0e49952968184c44d989770f29e6c
font_03_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 20256 bytes
SHA-256: 3efbec3660d9b46926eabaad003311655e356c2cc47247e1d314aceef5d687b9

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