Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c6c2b5b5dd5660…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 12:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7d03fb893ada89d9adce34c65133da9 SHA-1: 31dbafa439e87b4a9f1137beb436c26ca81bc879 SHA-256: 90c6c2b5b5dd566006f2beea03f3b1b90b20d5638ac8d2bf27e993f5947e21ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/prr6fbhgv0qmove7efssifvus0/3659874106.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7bc69a98507f482c2c9566d34ebe2ca8/11208253840.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/29a69afe734d86e05a7f4e8ff8b96118/lenokivinukovosidogoki.pdf
    • http://icwest78.com/clients/67591/File/nulesuj.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/94924504221.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3cbc0da59---41936663475.pdf
    • https://syntellect.ru/Repository/file/zumawegusasa.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0cddb4a2d0298fcd2ac01869a30efc76/71838288859.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/17a977ba2474d451c297251a28c439cb/57512392620.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725ac9dcbc7---wuwimutuduwetavarote.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/896c15d853b15cd61454c1d5bb9e8620/wijipopusuvonilorax.pdf
    • http://bafiti.com/sklep/userfiles/file/muxulevajuxavuluputu.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0lf3fq70n9elovade3s86rf1cp/xulirezajutilolofebomi.pdf
    • http://bright-mineral.com/uploadfile/file/2021052022191940.pdf
    • http://ahcxdq.com/uploads/file/12024720625.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a4696679---tevizuposuzumenutab.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c49e2c92b55---vogabo.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/42294598760b0c6718be8e.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd90bdde4---vuwuwiteniraxeson.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63a54a5e5---ribowowazinugekusebanukup.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zekisotowasekijaku.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/70498585350.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c5b1493afa434e5d1dd3bb347918aa1c/pujiwevurote.pdf
    • https://anmoul.com/userfiles/file/katidafidekazivipujo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=should+you+exercise+with+doms
    • 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_off0000f0a7.bin
5903e6864f2442d83bfab72c3196fc533837095807ed0ad68306e4330897728b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16328 bytes
font_01_sfnt_off00011af1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16792 bytes
font_02_sfnt_off00013308.bin
34a8c435e73ebe8924147b21c2892af8fc2a3eac2d299cfedf394f644adc9049
pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 10848 bytes