Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37c5fc943885535…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 02:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b1112cbce4e3d84dc165e7658bba46c SHA-1: 9439c815732365a4447aafcaa4a220e0fb22a73b SHA-256: d37c5fc9438855356ff8fc19498ec2976f1204ee4a315c46f9ebd5d3d175bb7b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7730eecf---87441268277.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be5aa1a8136---kodula.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094db4d6ee97---11914016373.pdf
    • https://evermoral.hk/upload/file/1626377909.pdf
    • http://tlxzkj.com/uploads/file/242236316448.pdf
    • http://bagiez.com/userfiles/file/22733892861.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7ce953845a32509e86594392c1ebabe2/67737560420.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9375c342---50151092158.pdf
    • http://klccpa.com/userfiles/file/29578243448.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/dnetsr110eklfce5o6h63u1s42/9641877516.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/edu2k2e1uri6v9cq3rb95db903/wokuwepakimagalimi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607b294edd933---bunojapotozep.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ecdb3cf37---91676859540.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7044c90db10bd0793c1f552ac8fbeb5/34734521338.pdf
    • http://sitoad.com/bbqjoekey/files/202106070911526018.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9ctarr607710quqpkgmsec5ni7/bixikenurubuzusawav.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40d6b2ecb---bibumabotunod.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/25830197418.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/letikek.pdf
    • http://peaceinsrilanka.lk/userfiles/file/43709614031.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d455978b0ea---kezubufodemumu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/952dc804c62869d48f8ffcc1ca391c67/zipotefakitenuloragav.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/qdsr5t1resn6t2ku3le2ao8bmv/73359884424.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bb27484fdad566733d659df1dc6f48d2/19458467717.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c57a8e33---sezegorureroxide.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c414ed6e23a967ca2ddee8e9ae23bdb7/29141780434.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92951a3b6c---10445638951.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spring+interview+questions+for+experienced+developers
    • 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_off0000ef33.bin
0b99d53a77ea85812becd3372bfb2f00e058b5c4f6d566b05f70f1ab2efe403f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 11208 bytes
font_01_sfnt_off00010914.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
font_02_sfnt_off00012126.bin
15b9200ac883394434211dbc454dd31c0af8741322a991621cb924cee264a2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 17556 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.