Malicious PDF — malware analysis report

Static analysis result for SHA-256 378577c42d8b9b91…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 05:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c4b7f69d09e032d82ed15ea776ff131 SHA-1: b5936b235f81cc16c15a473af3635773bb3d7b53 SHA-256: 378577c42d8b9b915031ee403ac9ab443afba96ce2147df7418407d3f437193c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://acmemask.com/upfiles/editor/files/11559962429.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c77n2bs1afveijnd0tlv8quq06/zetowuxugi.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f2b942967---39514871333.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6ec82e10---81275993833.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fcfb716b3c97adc1947950626678ab20/robevirameluziwekimisefi.pdf
    • http://www.moyekolodin.com/files/95822833227.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uf6fkm1n5pgnudgkhvjic8plj6/duxogole.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfd9bae2ce---35840040232.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ec6964795448cdae7bb3c6804b902c98/ditoz.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2f088f31---dakekokazuvosubemomamebuz.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dc92c0ebf77d866f050524059e1366ac/1430402523.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/546cc89508a0f94815ca26539bbab988/68426813593.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc059882f---26585414463.pdf
    • http://angarakshaksecurity.com/userfiles/file/69631499998.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa9b42239---25906716351.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/23b390e6b7cd839f6be4b2132df42399/86318690309.pdf
    • http://hutergroup.de/userfiles/file/vikoleki.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e85f0aa95---58783614925.pdf
    • http://ferramentabelleggia.it/public/file/89036492905.pdf
    • http://www.odnpoznan.pl/fotki/file/file/21368246979.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/kalamip.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd6152029---73179222622.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6bc13e12bba10760e3b53ebb9d4506f0/zedir.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b406f978c60fd7500865740423fd90a9/tizuluno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=path+of+exile+class
    • 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_off0000ee85.bin
9edcf174e1287dbb0fdb7ad92dd60c93089ad88468d8bfc3cad628461a697ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16848 bytes
font_01_sfnt_off00011a7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16792 bytes
font_02_sfnt_off00013295.bin
65d52d016d81ecde74663c25b998a68657c9a20d9f7637e41008c64879d84426
pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 10332 bytes