Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ec0a4a35f1c5e9…

MALICIOUS

PDF

152.1 KB Created: 2021-08-19 20:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1045a4143cbbcd85c2945573fc13fb5 SHA-1: dcd984051512be133fc04dae978feb9d1c20dba2 SHA-256: 43ec0a4a35f1c5e94fa71f571b6b21063a4690c2d6ea4c0fb5413e301e5a1c7d
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a payload via a visual download lure. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5oies7amgucg46uvi6r8gbnvbf/56369325684.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5ce24fe6---widibumigebifumuzojosov.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/sugufi.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/77760272506fde7dc0b3fa87c894e86e/46598583676.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9da853891---33698226952.pdfIn PDF document text
    • https://posh.hr/files/10509697853.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/47535473056.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nogikisiligibibupobeno.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7648ed8f19---fomaposajafori.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ce68bfac---49147202931.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vemasadidavon.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/del2368c9h6tsd80kcl0709tpk/34444300230.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/61249587406.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/51803435197.pdfIn PDF document text
    • https://kawanmto.org/contents//files/vasutabex.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2ce0a9de03899fa67a9773b6e1c0a7e2/moselodabiwel.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/tebegajob.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de15e617918---571216297.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/a85g14l4b87m1sq3192lut1umq/13581393643.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/13670958027.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe040bcfa4---munigibukebuzose.pdfIn PDF document text
    • http://candientushinko.com/images/file/77924861103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=etica+en+los+negocios+joseph+weiss+pdfPDF 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_off0001f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F000 10996 bytes
SHA-256: cd3ace79fd82727ca1b85c3c35de15c3e51bc8bbfc14dd9f7fe56552b26e1e5a
font_01_sfnt_off00020951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22163 19004 bytes
SHA-256: 8aa91800e8c616cfe0c92d07091dfab2b8456cf4c288cd5a4ec4678513008cdd