Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f9b49c192ea195…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 06:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3035d8bf0de9b61497cd4f35cb91f27c SHA-1: 93ba6fef1ca964df33ff6997c6c16cd087e52eeb SHA-256: 97f9b49c192ea195f3b9af6f26589005cb9a512f02a026f8c9c8db752fca3a0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3ed294f4b69c435d6dea98f84d7b623a/febomesoguvusoba.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/3443727623.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/67348362245.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabb876fb6---38523612868.pdfIn PDF document text
    • http://melvin.cz/data/85135796630.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/tixabiduritaripanuwi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/afbc3aa665512a266053c7d388b5420b/2957675505.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92d2b7fe9---52659663857.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cl43q61eont9rvnd0rk48rqr43/40575116187.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/idbhpnum8i9vhf5172act00bk3/58700499061.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171e851229---difixarezedava.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/56966484761.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/28405640220.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/63375233573.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/46244633153.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/23218411466.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/50197758803.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/josix.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/kirizorarisusujimi.pdfIn PDF document text
    • http://sivam.pl/files/file/53215736539.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/20420694829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+nespresso+lattissima+proPDF 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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10504 bytes
SHA-256: 5bcc355c1b0b499323fc4095a8c5fb3d444723fdb4b194f933b55a0003b081f3
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 17028 bytes
SHA-256: d24c59e619e1fc07d5ce2e58492ea7f037be2296c5bfa8be7cdc387db8312af9

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