Malicious PDF — malware analysis report

Static analysis result for SHA-256 122c5de1344799b7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 04:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5542310b3d029ea7299a69d62801cd9d SHA-1: 3cb6a85bd7c6ae48ffff09b8d1cbe9e1585699d9 SHA-256: 122c5de1344799b78f71475e55c251bbea7a7cc605930bb1dff73fcdc591117c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external PDF files hosted on compromised CMS uploads and disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5656bd8e7f---91602637915.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/26d9741e6d214d9dfce32ede869b47c5/28793012747.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/jibagodaxezedelako.pdfPDF link annotation
    • http://davidlbrooks.com/clients/868292/File/73447242419.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab63bf964---5186247801.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c2b0861dc72ba3612240be2ebed4dbc0/dowitixisava.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b16e64882---88231516755.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sigovufif.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/mijubawotogit.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f1fa13a7---datamadoxogaxuzesugubax.pdfIn PDF document text
    • http://kgmda.com/upload/files/21239115646.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/54224927247.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3d96ptq4eegr0nlsbi84pgj594/lisimilebumelosexebipupe.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/16532217257.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fudogalawisuwikiwaravifi.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1629516862.pdfIn PDF document text
    • https://anaksemut.com/contents//files/83001847482.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/4153178830.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zaroduja.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/52214994993.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/20336845093.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/50349654204.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a66a74f00---malumafilide.pdfIn PDF document text
    • http://synhbio.com/upload/files/47326725251.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2532bd9f3---37689373280.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eit3kkpu0qlclb3cco828auk24/bojukisejitexoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=electronic+devices+and+circuits+viva+questions+with+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 11096 bytes
SHA-256: 2b694c76df2b867a011ab64697a9e9e1c3c615e80850c4bb62e8999e6f785190
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 17352 bytes
SHA-256: 8412b5dd1f20e35d774e8ccf311403ba4b597d4d7368f3d53058c719d6ec70ef