Malicious PDF — malware analysis report

Static analysis result for SHA-256 93318dba2b61a532…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 13:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 197530533a5bb2395be5cf0a2f932d2a SHA-1: b7b2cf26e8f461a8b7dd797852c079fd9cca6b3e SHA-256: 93318dba2b61a532a2dc3e952b2e00d3860189adb726eb921668fa16d66bc15b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://akademia-jedenastka.pl/zdjecia/fck/file/bimoberorux.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cbabdfc0b83def142b6a7f2e11f993b3/90116000251.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd932ded5a6e1e57ab0f03d2dc7f1d2b/koxetototazumupokaki.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56e27a89---3891957464.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c2972af0c---41775328241.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc5e185d8---fegisageju.pdf
    • https://khanikango.in/file/55172158582.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/og2vs9t6cncgmnmvq22tv9gg4a/5079968607.pdf
    • http://thienlongadv.com/upload/files/45162000948.pdf
    • http://nuraski.pl/wsg/userfiles/julefuxibefaxijefopetegi.pdf
    • http://xaydunghoangthanh.com/img_duhoc/files/ziromiro.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/aece3acc52a8cb521bc0ae0a875b6cca/foxakekezirikozepepotu.pdf
    • http://mu-rrrc.com/userfiles/file/kinunujabubeboxomup.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/40657809487.pdf
    • http://backupcenters.com/userfiles/file/33066969090.pdf
    • http://alpha-cp.com/userfiles/file/tobitubikoz.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbf23fa2a---bowidilazipitopovamerok.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8eb56fd99---73043328046.pdf
    • https://realschoolspirit.net/scauserfiles/files/39851834322.pdf
    • http://airconbank.com/upload/fckeditor/file/5196874477.pdf
    • http://sciattella.net/images/file/74637669744.pdf
    • http://project-lovcen.me/userfiles/file/84545847470.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070693c90bbe---zunezivuputumu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=seven+letter+word+beginning+with+d
    • 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_off0000f854.bin
e8dfe58a9d3b41fc022b62775309610239545ea3deffcd9ad43c2ec5ef9ec8e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 17808 bytes
font_01_sfnt_off00012734.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
font_02_sfnt_off00013f4b.bin
ef021e6589f53e36a7720fd1ec24a6eca6218cbca81e406efd75f3db7dbab050
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 10564 bytes