Malicious PDF — malware analysis report

Static analysis result for SHA-256 1557d167d8964237…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 11:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a7e8b9ac4262e7de194cfe3f5718d63 SHA-1: f55f611bd0f42c4ef2ae3df7813930cd1aeac801 SHA-256: 1557d167d89642376a0b7389e28012ed4c4c8478025b61c34a7d5e8a1c3829b2
156 Risk Score

Malware Insights

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

The PDF file was identified 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 compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings strongly indicate the PDF's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://inwebjor.ru/uplcv?utm_term=introductory+verbs+in+reported+speech+pdf PDF link annotation
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/bukutawevibefokuveriz.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2o439g4a51qj5e4ve3s3g6ae6t/7656711610.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8996682f4ecd697e4cab8765c5eeffc1/53252529854.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e594abf98e6d27923fc90bc335b0aaf7/nawapotikafigufu.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/36710224380.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/17553226059.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mazojavoribezamidolinilo.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/dakikifatuzize.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d288fcd9f34---wivikovosukeluzelufetasu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t8c1s024e96psonvvrdjgamud1/nutalajojinunuxeluna.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/tokozotorumogejinorumo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161167f1117d5c---42869071749.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070445360e61---neragefakabefusux.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zikeluzojeteje.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e58e6504a---58261277872.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4ff1652d---xuwizajepupidutiwerut.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/27812176037.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/fefipeb.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/pifepenunivudasamobudavo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf939c0ad55---torutusigegakuput.pdfIn PDF document text
    • https://castel.ro/userfiles/file/18393730055.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 10880 bytes
SHA-256: 60e38a1ed8e328f77a0b6e0fb38bbf4c78737316610bd7387d4ecfccd6a097f9
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 19304 bytes
SHA-256: 99fe3f430f4258b2566438731d225f8edb526acaa84efb3721ab6ad84db4ac39
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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