Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b629d347a5f776d…

MALICIOUS

PDF

91.8 KB Created: 2021-07-06 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edc24a45eee5e02b320276654df4651c SHA-1: 863065bd95faf6422a7c002ec25f56d26cc8e9c9 SHA-256: 5b629d347a5f776da97056fbe15167d701a7883b510b910512dbf0ead352075e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Analysis revealed a link farm structure with multiple URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the presence of numerous suspicious links strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/17188941249.pdf In PDF document text
    • http://artin-intranet.com/ckupload/files/74755634787.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/13396543763.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0442849e8e47d65c02be83e54b4e46c5/lelezupaxapi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608113b9e7c76---lujerudoniselutob.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7b3828158fce904850be4af914e23eda/88395805042.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b485db7698c---jemubixorujoka.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/47731350125.pdfIn PDF document text
    • http://mega.kz/media/upload/files/gakepikejebafarowemi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5acb08e025f27fcfc7dd452e6375a5d6/92558196520.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/228d46894841725b27cca96cd93c77a9/13575540611.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/85590003944.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667266c8e0---88955120672.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aeb93bf51---romuraxijefoj.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/62d15a21d6e87ce28acdcebfd94387ac/xidepituf.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/esnmvnukh546ph0sp3mgc3e065/93170028705.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be59751a177---rigibawerovukaj.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850644769b7---lixixiwid.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cae1524a---powidivabekopunabe.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/rukizolesifukokipoxetutef.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/figuguzebexatuforuzexuguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stress+strain+curve+for+mild+steel+explanationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 18220 bytes
SHA-256: b88a18f4f53379788dc50fd1996f7a6927ac1370e5882c5f5003cb170ca06ed2
font_03_sfnt_off00014778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14778 11124 bytes
SHA-256: 1feab196909ad5b5f5333e6fab6d666b03c0539b9d9fe8a6cd1224a9f9634ac6

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