Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16030b0711f3db1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 01:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4f35092258cc63142027e5ec6cf3353 SHA-1: 910fe8134dbc3f0a27cbec71e20635ac1c550130 SHA-256: a16030b0711f3db181477ebc3778fd0c3e3994b267ea3f9cad0cdc1af0527b2f
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8679

Heuristics 5

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=sing+down+the+moon+pdf PDF link annotation
    • https://ferado.vn/userfiles/file/fetowomoni.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105280708399486.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bekozidamusa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bfd3416c---sasuluzosag.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/67171722039.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-4/20210604203206639152.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/boxitovepaliwej.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c6q3ajdrkggpnjflqb9u948ak7/13407949341.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5b6060b7---93140819975.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c3351b3e51f---jujovexugor.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e107137db---61096339552.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/91365634098.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/supuwujaterabidivapew.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/30190560124.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/46282142062.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/irgv76f5tcu9vc4u9oanpjj7rn/jilurajarivugibojifu.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/zemeg.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8891c8dcc3---19956726751.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1aad7b1640---nevimalalanejavat.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tabukotut.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/26220518683.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/dujiwuw.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/74887602436.pdfIn PDF document text
    • 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10628 bytes
SHA-256: aa3530e7b7219b1c4d5ba472b2fb5856e6d501dceade21bc9a59ad1e0dee0496
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17636 bytes
SHA-256: 6e949964fbe29099ffe8f6c0ab34270d9227980376369ec7b3b1c14e17006cdf

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