Malicious PDF — malware analysis report

Static analysis result for SHA-256 986e8e0ef631f11c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 14:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 204bddebf7be8fc43fee3f01e39b5465 SHA-1: a1417466690cf11616e65e9b02b41951a0768ad9 SHA-256: 986e8e0ef631f11c1dd498bf391182952dd96bcfbe4a83dc0d9562509be72b72
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites. Some of these URLs are hosted on what appear to be compromised CMS upload directories, suggesting a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • 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
  • 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://ozdesignhouse.com/app/webroot/uploads/files/mevawaju.pdf In PDF document text
    • http://sanmorales.es/userfiles/files/rimetiditugijevawu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/36635726764.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b0292d3ef5086ffabad28791ead5b51/25672158836.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/zaturiz.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ede182790474f539e8a57851919b598b/tixunun.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ed0tsr59l9g6c6g5r09gdftvgs/pewadusonopubalijivisuvij.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080863c54e03---wogujufulu.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zuzopobanuwenomokudo.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/libosaxosibojut.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/55585091749.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/43207437194.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/wodan.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jekako.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/vovur.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093214918a39---9050591370.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e62b42006364680fd2fcf90f9cebabdc/8734824802.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55546403916.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nexoletekirasonorolizeran.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/53410698551.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d3e5df99---xenagufemis.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec33d92765---64196155178.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/sufebiweteterakewax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=small+paper+flower+templates+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 18040 bytes
SHA-256: bc816ed4af2dd5624c3165e96923ed0e7bcf2776fb20d93f41fd010077b00f95
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 10624 bytes
SHA-256: 5d40406137e28217747e97c4926bed1503acff4ee983723f2791a3282ac724ed