Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c095d28ea7d7608…

MALICIOUS

PDF

103.3 KB Created: 2021-09-07 07:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10068b5d88223a696ed171c0f73a3a82 SHA-1: 3c0a60d48154f8499aff45c36dc6943a202e7812 SHA-256: 8c095d28ea7d7608613cebdf9f4ca723b10e9f03e717424d1954352b18e9aa6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or compromised CMS upload storage, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=micro+milling+machine+pdf PDF link annotation
    • http://dxqzx.com/ckfinder/userfiles/files/20210830_054158.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/45740674420.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/98135269669.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/14908185296.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/50830197090.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a0317af4d4edaa737381702337652ece/limebenufiminenogeberapag.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/foxavuzijituzuripogakiva.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/71667676698.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/misajivatelok.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/xujozibajajolenewer.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/127911619160e33cd8a5a6a.pdfIn PDF document text
    • http://gptools.net/userfiles/file/buwogojipifimewiv.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f41d4920b---47889603528.pdfIn PDF document text
    • http://lobi.md/userfiles/file/47846118277.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/gobosevo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff033fe2ac4---97347942115.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/woneb.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/puxalukivakuvewatoteto.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/xiduga.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/ponesurugo.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/rupaxibixurirogowepalox.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7f6d09508d2ddccf0d1c1f2ec96d296e/38027842184.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/91157888415.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_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 18656 bytes
SHA-256: c70755415a0133049d5d8673ef04c8f230ac59b81ba1eacd93f2847b182a9cbf
font_01_sfnt_off00015f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17762 10792 bytes
SHA-256: f7a995f8354c4aa5f9192f910ccc4a4a89ea485b3188a8617abc3264304ba122

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