Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c75304b63e76a7…

MALICIOUS

PDF

87.2 KB Created: 2021-08-23 18:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dae19266a678b702a83e19e0af5ad6fc SHA-1: 213816db46661d15822d9f96a83baf07a781d0ee SHA-256: c0c75304b63e76a7790ffc737e7122cc1131101c21f0a4a610a144e9ecc5f1df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://pistant.ru/uplcv?utm_term=introduction+to+biopsychology+pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/265b5849d03f85eeb5dde63bc01229a6/fedud.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ue0gqu6qm2eh07g0graqriu7t6/sojaralur.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160adc432f0323---bepigozibolafemowodeme.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/74757644024.pdf
    • http://ulv-fogger.es/d/files/jisosokunebozo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082766797d83---geliguzogagiku.pdf
    • https://lawina-radom.pl/files/file/93073017466.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r7vdnqrgor54qncr9v3vor8l3a/43902035590.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents//files/71902032225.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4875b4074e32e8f0a5ec1001cc4428b/wegewegikikoruzex.pdf
    • http://poltinik.ru/userfiles/file/dinopilodasarinarorusale.pdf
    • https://dcoderesearch.com/uploads/42662393720.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/8225487903.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ca099ad820d71d75b98ee3dfd5d4e6d3/79099509566.pdf
    • https://0a3exp.com/upfiles/editor/files/vujibig.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/hqo6oov0ir2nqr5pbv09qc3oio/kuvobodotulimusaxeto.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e56a6fe3---vogazazuzanazobuzusora.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210802024557.pdf
    • http://land89.com/ckupload/files/24476149931.pdf
    • https://sieuviet.net/webroot/img/files/tozas.pdf
    • 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_off0000f1ba.bin
6d109cf70141fe8e791a847650614378f43020368c0dd5e53047791aa447ebdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 17044 bytes
font_01_sfnt_off00011dbe.bin
0c4d621deb05df007c7c07ce51691efee846cda99c30dd4ca469d47e1cd527e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 10908 bytes
font_02_sfnt_off0001367b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 16792 bytes

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