Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6fcbf707ee763a…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 01:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6fc0b33b3f78d910e1da1017d1d096e SHA-1: 3cb29f2d112f4be19df7585be67f294c4e801ff7 SHA-256: bf6fcbf707ee763a4833431e51947a745a680c6b965ab15c20b701ee5684b056
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. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS upload storage. While no scripts were extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/42c6c6d6493df3661485435ece033d7d/66325243111.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/776992d7ba5254516e56717e0afe63ab/tupawoginamepakusotabitef.pdf
    • http://coopmong.com/ckupload/files/bolumedesamezo.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/wiwikituvowe.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/47af75b7a612a4c6e783b1b2fd4a762a/58484516808.pdf
    • http://aelma.com/sites/default/userfiles/file/zadogebalaru.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c45ef3c6a---97075450047.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab53636ec---jajize.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112ee52ed6---57747869508.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/j3cj4vh0ep7vsm2ss16sr1n46d/2355940007.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e60d887ed740241f68852c15f0fcd570/tafodipiguk.pdf
    • https://angkortaxiservice.com/userfiles/file/21110063917.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b444e8100b5572836e10fa398689917a/tobadomi.pdf
    • http://schodylux.pl/userfiles/file/zakigep.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47e5d9505---kedukagipogakumosupofa.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/79e2aed5f5942ecc233dd6761e5358ff/9292209023.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/muvuxibo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cf883deff9076561b80c76cb39d790cc/81946576671.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0568b51c75---kelila.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/89832257842.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8de33443---gebudumukada.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec3bd4c34---ziwesomipuwulenupe.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62c28d8cd---javigevirodimu.pdf
    • http://fresh-j.info/images/uploadedimages/file/gorapesedixevag.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23f2bb7d5---56477358133.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc453953f---30956630406.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=in+the+frame
    • 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_off0000ed69.bin
8d9415c2e23079b3cb81291de43e616603a521f4652caf123b2d7539ae768fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 16644 bytes
font_01_sfnt_off00011898.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 16792 bytes
font_02_sfnt_off000130af.bin
77332b02eaefe2cac2c44970a638ede03fb4a5bd103b25edb2d780480d7caf53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 10004 bytes

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