Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ffe31097533332…

MALICIOUS

PDF

92.2 KB Created: 2021-07-02 00:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e00e16f62c84d079c49f6f998ff13a1 SHA-1: d958f57027ee33938f9c2d9683f25e1e7f234d76 SHA-256: 54ffe3109753333274c2a2377b2f1aad55bdea59f2dbd7b7612bb4f4a5e172dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links on compromised CMS upload storage suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://iglozawiercie.pl/zdjecia/file/nijexegifobetazosukino.pdf In PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b07dcca38fa61edc64b1ccf085b87cea/35902470160.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1a05380a---kumekipaxifarem.pdfIn PDF document text
    • https://assistenza-termica.it/file/69009883380.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d86c7f670---zafigir.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210627_FB05C37EBF282085.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16073e64cadad9---95287997863.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccb12ba3d5---fujumubunitijo.pdfIn PDF document text
    • http://ibb-online.ru/f/file/wisisapavedesekis.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/81688547960.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843dae7cf9---31970938454.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5b1f0128---dunaz.pdfIn PDF document text
    • http://tochalco.com/uploads/files/gibobi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2cd04b3b396e60b46c36f5265d42d699/rumibigemagakigoxe.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7njpasnf81q9dk6nmok4gqrmu6/94145194751.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/badarurelevoradunema.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/86570821676.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b417a1a823e---tuxosasud.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/22513ccdc35852ef683ab9e00665d25a/pibodenitudu.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/46952113906.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd11710ceaa63624df616107eb26efa7/minipinozukigijokebi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853229b8146---64423678093.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0155d6f47bee05f27d6ca9a7b0fd0aa3/46733880459.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r565nb8oufotpc234cpubrt25v/1374590312.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/61fdc08936ae70e84f1bf35cadea6ca1/figimufezimapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tell+us+about+yourself+examplePDF 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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 10740 bytes
SHA-256: 901458e05019bdfe6f82eac30077c61fd71e5ab129cc9d8d005bab600b6b056f
font_02_sfnt_off000134cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 17264 bytes
SHA-256: 556e31f37dfefcd942a960c170a6396fada696dce8c0c214bacdfe0ab30b8760