Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ba0f2a4f36a05a…

MALICIOUS

PDF

96.9 KB Created: 2021-07-08 07:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f7eca9eefaf51afd2320158b8cc65cb SHA-1: 6514f10f14b9a1776fecd60367bb25ac91059980 SHA-256: d4ba0f2a4f36a05a0890a65644ab4e0dc2e669c4bd7f19813e9840b4037b3678
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pistant.ru/uplcv?utm_term=how+to+forward+pdf+file PDF link annotation
    • http://www.vegagastro.pl/upload/file/95653694357.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/28576941857.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a301f152a---72325909797.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/67410217585.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde4bd88876---780511022.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjs89jo1aei3al3irucnpq9ff4/fenamevukipupuko.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818d45eb46f---52969683934.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/29460031070.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098323e97622---kovirigepotuwunon.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/74450685523.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8at94r65bugnvkb9bhls01gcq1/91500519057.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb1403e02---vufob.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210630215131153.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/49317516459.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/fafubipamafudunuje.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/zokad.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/fc5c8a568191a0bb8eb7409333be4d9a/tokanawesuxitek.pdfIn PDF document text
    • http://sciattella.net/images/file/vixiboju.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/31040440832.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097112e22a3d---35876385996.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/18389410939.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lovozexawogimox.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_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 18308 bytes
SHA-256: 82db41e9f9db29f65c4a6bc422fd0a7b3aae9076b2cb3f00ab7974a05ffc5ef2
font_02_sfnt_off00015f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2E 10296 bytes
SHA-256: 465dc61d98be755018b254213ee6f83785e769adc9e4ff4389eb3d82e833ba0c

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