Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb937e4ab67881d4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fef6e5b541ff46364f0fe5f37b9f9733 SHA-1: 8be460e13f83b46cb05cf526206cb9b530342364 SHA-256: bb937e4ab67881d403602a40d9aa6eedbdb03af51c7bde32627612af91e401cb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute a payload. The presence of a visual download button and password instructions further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=reduce+pdf+file+size+for+free PDF link annotation
    • http://beymersan.org/upload/files/nezixigujib.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/jivupenigug.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/mizoxuvokulam.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823a2971dcd---noziforazol.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/deninunowepeguzu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601fb9c77a---vexugevexagegun.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/purumixu.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/22960985999.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/93854667942.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/lakigapisodinerozolupuf.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4540d8d71d2d12d0c3c256ee4a382c9c/15527351284.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/kejosoxe.pdfIn PDF document text
    • http://cymagun.com/userfiles/40141873506.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161292f56d8353---vudemutanafudojirafovu.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/80467577240.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/rozijajivikesegalemana.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xujexebegibigusefis.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16105b70e8ce17---pomoxuninozuzamu.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/39575b579d76b19be814fa22607497c7/zenagoxibaruv.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf71d003fb---nosabudosaguv.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098342688f3c---pipobogolu.pdfIn PDF document text
    • http://0048.pl/48files/file/wubikadatulekubewibilaw.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e1a3ee8d---vomujelaledovemodawipub.pdfIn PDF document text
    • 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_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 10452 bytes
SHA-256: 35ac2b791cec94fc1b58765c735e047b6b330d6a51e94037a6ce1caa1f47d1dd
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 19396 bytes
SHA-256: ed9fc8bd0f3997d8c36f634ed7ab5ea78d8bfe06661a594dbad216668384ce8e
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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