Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c373532bd29e4fc…

MALICIOUS

PDF

89.0 KB Created: 2021-07-28 06:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7279b0201d580824db0a1465c349f46c SHA-1: aa8e890fff7499c8f1a71d253c4f1953e495ca64 SHA-256: 4c373532bd29e4fcdc8f7964ca3ba0ce4ecb1a4956c5594fde8f89c253574272
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of links to compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/xinakebe.pdf In PDF document text
    • http://clase86marista.com/clients/25276/File/gawitadam.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/guleputano.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/28590146940.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/96891061467.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a38e252f---36639216702.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087697a780b6---33677183172.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d377af75206---numirefofarafugederoboxus.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/38aadbe92f19bfc591bfa0a87114137f/77793607831.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b50da2094eb---vibevedarowub.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/23090649279.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075193e0d31f---63888115455.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6mqvp5hqg881gk7gpm7u9cvt43/kimulapofu.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/sedavu.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/19794487414.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vimumoresidiropunomof.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/razezifituwed.pdfIn PDF document text
    • https://epiphanych.com/images/file/69518770064.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/fodafafumejikipipulumefa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff86830820---96923811458.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/225f9c7d1bf5c987c8befa8e8caa4d1a/75686894921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+identify+strengths+and+weaknesses+of+a+research+paperPDF 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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16772 bytes
SHA-256: 9d2ed19b547f45da660fc55a3d55ba7d29f0c1658c0d2c7fd8cc96253a7b34eb
font_02_sfnt_off000139ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 11136 bytes
SHA-256: cc4462895a6555709e3db0c8b849d30b42c62878ef22b17fc8cba89f71728436

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