Malicious PDF — malware analysis report

Static analysis result for SHA-256 55223c65672526aa…

MALICIOUS

PDF

97.8 KB Created: 2021-07-06 04:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 55d06997bd1c4732eb5a9f1970ba8b23 SHA-1: 5328241642a1fb58a4cdfb2e582ef645ebfcc1fc SHA-256: 55223c65672526aa620faf293c472bcc2b9f6a71859d01159e23abd4112cc916
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of disposable hosting reinforce the nature of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/392c744f850d3791c86b87e489f34f53/fetejonapuwisetedobakagir.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b71866c919---87018392020.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c17cdaaffcf---84238911450.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nokadirovazuwizagezum.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hicb11got60tdkj9po3ljfcjjk/48670445723.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757cc876817---44696312454.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39a19167a7---lomurofusubuvojatewo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1b6cd5fab2136f338178ed5782d10326/15176639846.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a500c3fe9f---givanerinud.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8804ee073d---11967450499.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/52182777732.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/sujiwag.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///71254642259.pdfIn PDF document text
    • http://ombs.ru/uploads/files/76048806043.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/21267646184.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/menugajan.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed35ff3a15---36932167886.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/mogunatusov.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/03e3842c03a5afc8c0a4b666e0903270/kitamubemorewexaputubuvas.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f186ff71---86984412789.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/17288141804.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba1772895---83705036613.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/meparexigozaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=indian+relaxation+musicPDF 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_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10684 bytes
SHA-256: 744b6f8502d3a0ac4abd7a73f882a70250925753892e89d1db4e4ce9a29ef0c0
font_01_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 17384 bytes
SHA-256: 9e95c308334c9f1e54fe190a16ab7e42b22856c1e287ca98f919426a43a10cba
font_02_sfnt_off00016076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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