Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb257894eed6c58…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 08:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afc4e22ab4208d17ef5475930096438f SHA-1: b046c9e43ce5904296f3edcefd225b49b9a5b65b SHA-256: cdb257894eed6c581be3bb6d04f705889f805caa0c5cd9d2b8049ef1cc6315e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves directing users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://stiff.pl/ckfinder/userfiles/files/16968924914.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d861b997a---vawozinitidezuf.pdf
    • https://malashealthcare.com/userfiles/files/65385341761.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0b1b57f723dcb087054c61e2c217f0c5/suzijisalef.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a38d62652---35009526040.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5faddde8---67709559873.pdf
    • http://etcad.net/np/upfile/file/26137589338.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b67d24bf068dc2e148e661b5aa36fdb6/59402774368.pdf
    • http://ambvet-trefontane.eu/userfiles/files/nulemibodomoxulebufo.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/edbf994adbb24643d5ad5a0436ffeec0/zonojoredefuteb.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/93d16847bc28666290446cdc857ddc00/77360625893.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4462aaef---54356480969.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1773c5822b1a2db41115924fbd143da/tudune.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955e20e3de.pdf
    • https://likeevent.it/writable/public/userfiles/file/9975357484.pdf
    • http://shqinze.net/admin/upimg/file///pedelotixez.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/737e2df10b3b8440c859886c8e495800/54048717861.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/u7835hbals3drgoe6078qc3qra/togakusugewu.pdf
    • https://marigabung.com/contents//files/positufule.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bba14aca3---delubanitilo.pdf
    • http://kjphotocon.org/data/userfiles/files/xevofoxanolamomizuve.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/2bee762b00f7327323df7502bebd3b54/ragikuripumobabojepaju.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/97ba8f0e0a7d134a8b57751aa451e995/zagevanuleporaj.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1361d282ad---38880555655.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b2488555f---25265348468.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/dedoleniturir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=being+a+go+getter
    • 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_off0000ea7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16792 bytes
font_01_sfnt_off00010295.bin
72b44f558960fded1e2bfc88229f9e853c66ecdb418ae2d3c918cb1fddd277bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10120 bytes
font_02_sfnt_off0001194e.bin
9803be1140631523ce3ba9309d4658917ba27ebbc7ebac1637fcc9eb050c6b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 17072 bytes

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