Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc9f8bbc206370d…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 21:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b3e80a9c6c10f497862971e4f4278cf SHA-1: d128eb300fa6cfbf152ce14ad78cac61d70ea9d8 SHA-256: 8fc9f8bbc206370d614796af8e5ab7e3a4ea0691558011ae6564ba634e83d4bd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and numerous URLs suggest an attempt to manipulate search engine rankings or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://beergolfers.com./blog/images/file/guxunevususapusuforidu.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d9fe0e37df6f87be245351206b6c9082/88368303359.pdf
    • http://ridendo.cz/files/file/jataduzijajejekadajeru.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9b6030b3de6a45c7f02e7704e45dfd6b/lezuguvixibaneli.pdf
    • http://riskhedgetech.com/uploaded/file/1897222712609f766704c11.pdf
    • http://mav-auto.ru/images/file/getif.pdf
    • http://daindnc.com/fckeditor/userfiles/file/fukajabapebono.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16070a59681489---54222877376.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c4574550---koxuvoruzerokam.pdf
    • http://phuwangnam.com/user_file/file/moraxopadelokozajakaf.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb15fb667b---vazukolinogufanuxaliboso.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0daf4875e3---96559279797.pdf
    • http://j1medical.com/uploaded/file/13111262697.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cee0a45022---palepoxerutuwanogidu.pdf
    • http://originalcheck.it/public/img_admin/file///beniz.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0trnblmas2i09j2ofrdkjm3em3/67770533507.pdf
    • http://clairerolo.com/userfiles/file/watuguz.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8460428c84---wagafef.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e2cabe903---kikivipabi.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/7538603180.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/87bf8c47cfb57a1becbb7acc1d61e21f/24779981194.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/878c28d6da2162b3f4b96863e1552fb8/gijugunugabemejef.pdf
    • http://travelshops.pl/userfiles/file/wafepeduruken.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=signs+of+undiagnosed+autism+in+adults
    • 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_off0000f7ea.bin
130438c90636fd82c51401e90a88ac7b19eb75c16b64e240b7f203d3a29fe204
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 10772 bytes
font_01_sfnt_off0001107b.bin
1182b7556f7360d2537326a89735335bd24cd1ae4440a00468877b992d44142a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 17004 bytes
font_02_sfnt_off00013ce0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 16792 bytes