Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da5a4e8e3988ed4…

MALICIOUS

PDF

101.6 KB Created: 2021-06-28 00:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 599a26390ea993b29578a9db02e17a2c SHA-1: 3e17565b543f787f879da2e784111af983c7d45b SHA-256: 7da5a4e8e3988ed45445e3d6328f286d806d5ef83f0d168d6829fb3cc5dd03c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links on disposable hosting further supports a malicious purpose, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • 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
  • 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://studioturina.com/userfiles/files/71846047474.pdf
    • http://nordicaluminium.ru/userfiles/file/99560923311.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/q9eofrerq0aghmoevpju7od79f/sunulazaw.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5jgi8n00s5at3toeqcr85nuab0/12842052070.pdf
    • http://ricarda-allegra.de/userfiles/file/kefuzovafefufuvewu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b4956300b---81500365762.pdf
    • https://ludifrance.fr/userfiles/file/kufumozijumikanunata.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7926d7f3bc---12534280784.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b501ddd6d---69673799289.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ndpt2u0sdbdogntc73db518lro/poloweragu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f847b78e---befepupizutaxawiduj.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/71725230480.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f363e705---54460083143.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/78d14b505bf6e1a0278674c845f65b53/visofovolekowur.pdf
    • https://antae.be/app/webroot/uploads/file/38597513157.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/58619804503.pdf
    • http://adamlegal.com/userfiles/file/40129226436.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1ndt8282o9qr8iareedl6vm295/99952205446.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d3987341---wofejowijovu.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/21408168488.pdf
    • http://gld-lining.com/user_img/files/ranenit.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/23152457921.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072005696de7---papuz.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080877b91c57---80441110740.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+measure+of+each+angle+of+a+hexagon
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f53.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16088 bytes
font_01_sfnt_off00012489.bin
01efb43b1fe5cd8965af6e3cf7c9c034565d5e7961321870a562bc9510fd2847
pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 10976 bytes
font_02_sfnt_off00013de3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 16792 bytes
font_03_sfnt_off000155f5.bin
868871a48b9a635334b069436e3a7839adcccde97ea2b4305931e6c0306a70e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x155F5 18956 bytes