Malicious PDF — malware analysis report

Static analysis result for SHA-256 754cd2e64fe5c2f3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 03:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 355d00353c912acbc6882d2521c59485 SHA-1: 44ef11816295a05a104cdbccd56519172f8b7861 SHA-256: 754cd2e64fe5c2f32ac216a711a83402d8b69bab1377780483db7d839a7a9617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ddb42512---vamumaketu.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/35089446298.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/32051566129.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/53017391618.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140fca58298f---pevevubobap.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/95730674873.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/83816014531.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2ac9c0afabb9f5ca26a7b7a5fffe1a1a/57479821021.pdfIn PDF document text
    • http://egitara.com/upfiles/files/25208211658.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b80c3f83---16656120419.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/80580626568.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631318444.pdfIn PDF document text
    • https://reniuved.it/file/tofonifixafix.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da1d253a3---fuxisemaxufujobawakevivef.pdfIn PDF document text
    • https://servauto.fr/img/user/file/87232619496.pdfIn PDF document text
    • http://yanartextil.com/firma/files/91495023824.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a8305590---vovugugowirawurirabo.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/12840841949.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/22323711117.pdfIn PDF document text
    • https://hobbypet.cz/files/file/79519742711.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nonuzulem.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/33291897748.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26d498892---nerinux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=outwitt+download+apkPDF 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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 17616 bytes
SHA-256: e767ddc0c8b25b92f39ab8abea0a36687273d3fcf0830223d799c48f22a182d3
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 10288 bytes
SHA-256: 4083c4b24eb375a056f49fb5aced4ba66e3532da72b995de4f3aae056532a602

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