Malicious PDF — malware analysis report

Static analysis result for SHA-256 51808a07edf582f7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 20:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cc0039aefcc69bbc71704378ea90434 SHA-1: c5bf0e4cf407800864dcfc0ec38726b7f11c317d SHA-256: 51808a07edf582f7f59e6afb9c4cf7006a9bfaeac57523a70104907066a31e13
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload links suggests an attempt to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://worldofpacifiers.com/editor_uploads/system/files/lavuxumuvanisunapupox.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9dc1fb03bfcc3e91ea0fe0803f4ce974/lijibitotaxifata.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/tudetazozusuluperi.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109082542_1008572379.pdfIn PDF document text
    • https://wilde-signs.com/media/38805466317.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/jidozologo.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/vofobodobusugudabulezaf.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fovujifakunamotodo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131079be5245---sisik.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/16047689338.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c34d17f32---dixasasinewigike.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/86975293346.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/88674464182.pdfIn PDF document text
    • https://bczenekar.hu/files/file/fufevodijetigugigo.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/94085741053.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tutopurokowulaburuziwonib.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/75224671155.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/jalivuniguneter.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145f9c539408---mawedetibefatosepomu.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://sensi-leszno.pl/userfiles/file/66626303789.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/fojabozififubudopasoxuner.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/48303187029.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/19840030136.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/bizonomovarofuwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+emulator+downloadsPDF 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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 14940 bytes
SHA-256: 7fef6977a8bc2a6133989311c70dfc3321bc57d8c8eee8778120f932c0f79df2
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 10576 bytes
SHA-256: cc3de1c7e7839e6ec09395d5004285c98e3e1698bce4d963c4db9cf680873acf
font_02_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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