Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1319abd538613bf…

MALICIOUS

PDF

95.0 KB Created: 2021-07-24 19:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bdc48241e9712339a9e94b847469b857 SHA-1: 462c2e921500b060ed6f08ed2a56e92ab2615482 SHA-256: b1319abd538613bffdb10a18f6488824529ad170cbda4b3c7d84d4b9c2b96a32
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f2bf4007f---jegilisatapuvijume.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0h114fpj8hvpildha7hfvq0kf5/55910741115.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/gatoxelefevidirexolik.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce8e4c49---geberali.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/dokebafebepuselu.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/10366991919.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/dizixela.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e099dd50---balasoje.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5e41e4e7---tizusetef.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276f991780---76260917155.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bb3a6nl9fbcqhjca856gif1kq6/83300455323.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c5bb1c6e464.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nefogavukolovebasidijufi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099882b2964f---88073612957.pdfIn PDF document text
    • http://momsystem.ru/public/file/vefubisudisovatilub.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/tavinofamivozalo.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/xezukiw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9075856e3---viretidefafesa.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/wuxaveriwofigevigopu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf6d3f147---45536950838.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa43cac119---53458392084.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160771bd2e1e90---gaduvit.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/8933009274.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/taromefelibunam.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/rurenipifu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/419aa30c3d86d98a6b710d1c4166a142/xudezefudur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+atomic+theory+timelinePDF 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_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 10604 bytes
SHA-256: 66b21bfac61de6a33092dd17a3602e9a3b01d8888970780e19b33bf6556d492f
font_02_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 18428 bytes
SHA-256: ebb228cbe6c5b1c9f8c3227e9612b11a742e2ceea7304cd052bdbc8cf7e99b09