Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede9747c6852a4c1…

MALICIOUS

PDF

74.7 KB Created: 2021-07-25 21:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1dc185248a46eec13416329f035d8dd5 SHA-1: d81ff3d0fac9819e01ce2dd6cceacf34cce52877 SHA-256: ede9747c6852a4c16483806303581a3237074e7bb9ba273339990599b085ce04
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with exploitation techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c178b474db---somifogevav.pdf In PDF document text
    • http://sloplast.com/userfiles/files/masaxizakuvuzeka.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/92693178405.pdfIn PDF document text
    • https://jagominum.com/contents//files/wonivuzusaxezebuxatuloz.pdfIn PDF document text
    • https://signika.pl/Upload/file/80014196138.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7aa723c81c6fd93c0f942718b860b318/87052641430.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972ba0658---14051257038.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vug4rs816jtslgep2v950vldn5/21256488119.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/37340795722.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vpuk4lovvhg28b5ifc2d8ftedh/96865617752.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/34680647168.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/88773898795.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6d7515c6---77919881421.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/obpur96rifp7kgftjdqporjfrj/66815451703.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c248823b6a8---88295207111.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0163bd873985ff5753b42c8b00d95100/jefaxajugonewiwatuni.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ekkola3pd1e0fgod5opbg8rdf3/girimuj.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fufegasotija.pdfIn PDF document text
    • http://championsview.net/userimages/viwexegalojipemukaguvelel.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a44ce7a5658755d293fbcb19e7849247/24197461517.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87a45215f---65850051193.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e653d9d0---funexikijetuxarive.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dopedozazuwokilelewova.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/83221382121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+thread+an+elna+elina+pro+overlockerPDF 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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 10680 bytes
SHA-256: 9a177525d2f887c661d541ec98aa61975e65137245eb7cca24705ea27559e8a8
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16656 bytes
SHA-256: bfdb7a7f2d3dc808822df032d97bce56296c148c78769be07412a6198415be5d
font_02_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1