Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfb037eb834cb9e…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 12:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44159c6d42c28c6aed655c0d445617df SHA-1: 19107f48cc81903f18c6a1284135b472c0b58a3d SHA-256: abfb037eb834cb9e28737a51d138f39c382b6fbdae6b5107f2fff579a953eefe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting an effort to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studioagronomoserragiotto.eu/userfiles/files/25463455064.pdf
    • http://tahi.hu/ckfinder/userfiles/files/55483084693.pdf
    • https://lawyerupsmart.com/tempimg/file/fetererajagexulakamowuwu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabd57ec42---60406707022.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/70584406365.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bc174a2a5f6abc29032318b9ade6853c/48139009834.pdf
    • http://martonaroniskola.net/userfiles/file/21631687701.pdf
    • http://harasim.cz/uploaded/files/bufatitowatekisugupidu.pdf
    • http://marta-galan.com/files/varios/file/lizenomewipuwolimowuj.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v7bn13qtdm0q4aksv7e9r9fnr9/81439590122.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d946b37ea28---79168527973.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6f05a42f---25875860126.pdf
    • http://lab4050.com/upload/editor/file/34134086691.pdf
    • https://zohopinler.com/calisma2/files/uploads/wiwuvuxezoxot.pdf
    • https://bitree.com/ckfinder/userfiles/files/fiweli.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608236b6deb0b---86647710331.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fced115934c847e66d0b07c18c3fe821/lixugogudusalaruni.pdf
    • http://446888.top/userfiles/file/mudifuwalosifijuf.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f86bd2676---sakelulelavumebowigebul.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/553d9b989fdbaddb637d351152c8c4d6/1356420640.pdf
    • http://allaboutdowney.com/userimages/53979371346.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a5c9d133---gijogowu.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/pidazi.pdf
    • http://sotel-perm.ru/site/file/58511385914.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/fojejuzava.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=html+abbreviation+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab7.bin
877df69c1b2a35be4fd4cbc2b2c1d7e91c2c879175b999bb1b7968420b143caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 17228 bytes
font_01_sfnt_off000117fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 16792 bytes
font_02_sfnt_off00013013.bin
6238c5cf66726bb4deffae815608dd7a815fe52c03d707ecab529c6cfcb7ed75
pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 10480 bytes