Malicious PDF — malware analysis report

Static analysis result for SHA-256 17248ad13ba191ff…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 17:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75a3b33690961dd15fa4fb35423676e2 SHA-1: a0b5673a4826d2800f123c1cfdc0df7a745857ee SHA-256: 17248ad13ba191ff806d92e594998cf70c48db3785fcd3dbd10cefdcb119c007
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads, indicating it's designed as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable binary data, providing no direct user-facing content, but the heuristic firings confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sibservis.com/ckfinder/userfiles/files/90289544498.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503dc9a91f---podogefufutijulo.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/564b89ceda03176146c35b0759e0e9f7/88896187251.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/42540645153.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a9a1e2a3---fonawugofurepobivimakos.pdfIn PDF document text
    • http://rc-modeller.se/images/file///sotifufivewofadoxiwupet.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/dipobaxikiredodonev.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/117bbff5040c57770b16007e2fae05a8/41204963695.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45287421543.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zasojapelatil.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4db71dbf7---jilawatexikokig.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/50749546303.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b12394ff---koruwetitivifires.pdfIn PDF document text
    • https://combrooncom.com/contents//files/15496166989.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160848e2675059---67922883687.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396c707a30---fipute.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608238c095a45---12775288873.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb3be16a5---nisasa.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/suvum.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098467aeea33---14443477397.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210624_013040.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/5971703958.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tqi1j2oe6mer40fb36uf1a7ud2/57450062257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+point+croftonPDF 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_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 17672 bytes
SHA-256: 56be0d441a5162c890f77c102b8e107a9d302e7b87dc6058fddb7b779511dcba
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 10164 bytes
SHA-256: 3026d620fced5b871b8b8b81983533544c6b32d3512b577514513adff3eceac7

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