Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f4476f3268cfa6…

MALICIOUS

PDF

100.1 KB Created: 2021-08-26 07:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94fe39bf7b1126e3b61795bbaad04fd9 SHA-1: e6132e3ace74030e1028420d61a98a544609db55 SHA-256: 88f4476f3268cfa6877cb8e797e0df06afbf8961a84b30ee2d309d65777d8e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9fc43437---fizekutozemaxabob.pdf In PDF document text
    • https://internationalmedia.com/userfiles/file/tikujonisaluseporip.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/nerix.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0vm5rcctoj8ge8t9sj80ja7bhf/27915538416.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fca26865e---18251507493.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ef246037---litalowesuwigivutujetapi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/75707434166.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/300219lo85gecscslp5fjeabkt/26610167575.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2ab51da9ef9ce18158f6d2256f963f9c/9357966165.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/771466ca8fb9c1b02a85d730de53ab39/rufasipukejo.pdfIn PDF document text
    • http://poliinc.com/upload/files/98412060267.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae4b577f1---tajupodefevubadane.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa4f4e05d87e34a98ea3ec0cb4ed4c7c/8946907537.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/df54b2f05604e2c2ec1003f0ee51ed50/sazevunezitemasabopabax.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kazoxesupu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nurrdghrina4jrsmagotg6dah1/70254437545.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040159128714.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8apirfi9s9cn9maai47n90dlf1/zoxobemuxaxuno.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/77816427329.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608123854f826---28178444799.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zemapipebeboxata.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/xewotesupegemuketole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=auditing+arens+15th+edition+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_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 10996 bytes
SHA-256: 07da3bfcc161c6286beded62477c7114d687e634ddb1a0d6e314177484d51dec
font_01_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 16948 bytes
SHA-256: 179ce3ae5208e040ec7b63dd249fcdb0cc8558846d1d1f86e3da4698c1619254
font_02_sfnt_off000169f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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