Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a128ae21d099a1…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 13:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea622cab661cca43c8f675125b54f2ed SHA-1: 5f31c121c7eda333f5a003961000364c566857b2 SHA-256: 10a128ae21d099a1b2a8e1f0e089ef004a8e2a1e2dd3030060f3eb16a1f806c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9afe567a354cff44ba3270f98a579f3b/38821497876.pdf In PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/69154027419.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/r7qr10gpknnjp0ru57jbtd4c4i/sosevutifilimuwan.pdfIn PDF document text
    • http://seritour.com/rsm/files/wodelumajefixetiketelu.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/wasakinagujotaw.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rrm69dbci3hqdqgpfhu8udkogq/retobuwudonesutavukorutu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aff99871ab9---godufowuparopemevo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/i1c7tcqnme70l10sk75cbbh3cl/9627304101.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/bapepapewejafipidufoloji.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/37c969861e210a229bd57a6e48ed6b17/90628911579.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/81695384322.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/dexobod.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608362531382c---jezivapa.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/luwutej.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/ramoguwogadusulububegota.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/vakerutupawibe.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/20528525961.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/zukiwa.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3d96675c---doxewetoliwoxekitow.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/89212617152.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/83996052217.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/26944155828.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/49767438850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=romeu+e+julieta+em+pdfPDF 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_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 20820 bytes
SHA-256: f5ff74bf9295fef04f507ef6dd0f311776888c65520d217debed9c370b975486
font_01_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 10560 bytes
SHA-256: a729a478f5027ad3cb3317c3cba589b3851b598528f08e8f4db53b764d9a6f5c
font_02_sfnt_off00014a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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