Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b684a50f000de…

MALICIOUS

PDF

83.5 KB Created: 2021-07-01 17:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d6439e0f3fa80cd2eb77f478b05fa1fa SHA-1: 50ba31dc4db032f95b789166062aad114303778a SHA-256: 271b684a50f000dea8e4d1e80777859d0de9903f53e82622dcfe9088161faf85
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to manipulate search engine results or host malicious content. The PDF's structure and embedded links are consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://hotel-la-licorne.fr/userfiles/file/masorilesafabojipobux.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b9a12f77a---6782550665.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/45354752204.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/20337446022.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/een6a1fja1rvdos0ikh1eh69m8/77014640162.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/24397835626.pdfIn PDF document text
    • https://petikdaun.com/contents//files/46694969715.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/52308536188.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608082a249390---javekazonof.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/40143409938.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400ae1419---34270474715.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/20669323333.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7a6660e108605d3aff36c69ed61ce0d/49221370963.pdfIn PDF document text
    • http://sdds.be/userfiles/file/mukilolozorinog.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bk9f58r3sq6sm20t4msqo2qr67/logikibobagi.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/57185946088.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995d4d0415d---39546240346.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcb3b0e3b---91962058335.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/41695324965.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ccbeedcaca3c0779d2597eebf02ba7f6/62373627077.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8ded961e---nesaxijiwogivokame.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lifakujaz.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56e5d1b05---8262451945.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/38e231a1037484ddda2336b45e995007/64323759473.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b87847be234---pijep.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815a1a7c1df---91150660744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=us+style+manualPDF 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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 17492 bytes
SHA-256: 82c7491ea137b9492c8940066c5e6e9a7cbb3d81720c96e23261a1c675bfcd44
font_01_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 10180 bytes
SHA-256: cabf236dd67058a69750e249c2a615e73ddb2d8557e362f33ba4fc20d29be701

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