Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07dd3d38a1dad32…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 09:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce579f12b5c7093df369f85018b2b3df SHA-1: 0b5e8c36111c5fc90f1a14454b7b9de1bc0c300f SHA-256: d07dd3d38a1dad32d2c7714d5f61bcd9df567881a1c9f2b4c0b18da5f1410d56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://jecoexports.com/ckfinder/userfiles/files/tufivefafujolaliki.pdf In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/6378105839.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94af93a5c---vifilolokikud.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/gitama.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/daxet.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/lupan.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nolipujuzasaponuzozi.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210916175013516.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efc6f502cd5b3c3ddf68dd906244471c/83251348580.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/87487476359c6a81028f9d007d28c494/11679084431.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/73755266402.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/95569570169.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/savibulanuzajap.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/laxoranipekap.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/gerizijofefidanakazejowuw.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/rivewi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/gesajugifedamamoju.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/kurigelavadizujawuj.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/vipudupunow.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/xuguj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aedba2ae---tiludagalitafurugolubepam.pdfIn PDF document text
    • http://hexindechem.com/upload/files/10825421919.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/14133020800.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/74650706552.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/55626380194.pdfIn PDF document text
    • https://buka.ru/sadm_files/51550085158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=get+windows+8+keyPDF 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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 10472 bytes
SHA-256: 949a8427f133edbd402b7a5d818fe6f4011af21a10715d1f2d61831bd85a0bb8
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 17472 bytes
SHA-256: 3f3f3e6cfeb2ec31f5a380307e2ff33e8487fd8af8edb5536c92796177c2b95f
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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