Malicious PDF — malware analysis report

Static analysis result for SHA-256 180dbb040e29f27f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 23:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d9d583e18b560a69cab139220bb91fa SHA-1: 1bed12c24c16ab8959046bf85027f2708f5ffb24 SHA-256: 180dbb040e29f27fb484bb9f9e1e744afefda2befd75c32b234a0b6744dd522f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The PDF structure itself does not contain executable scripts, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bamkprstm1tu6kgeohop6gpm6u/mupid.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/suxuk.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9f37624f42751e30eb094200c4af54b6/nagatiw.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/81333435800.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e049fe4ec3---putavifomezuwetofexod.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/5037391350.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/6438219962.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gebavadebubato.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/25699048253.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/bosezesokebadumizapi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a1f285fcce6dcddf4a5c7541beea85f1/favubelisol.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/kerabovuxosape.pdfIn PDF document text
    • http://mp-journal.com/media/file/kudobesasi.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/baxodalesozoduzurakatiwan.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/mosodovevesenu.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/46539014227.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tivikigelof.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5026cdf7eb---puvug.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wezofekojefimaled.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e8e2b0b9bc5e908773364e509407d293/zumiguminig.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/19291191615.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/sufofibawuzilaluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=condensed+electron+configuration+for+sePDF 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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10780 bytes
SHA-256: 2238591189b5655619315d5b80e3a5719d31fd55210dae859e23696e79aabcb8
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 19264 bytes
SHA-256: eed956366d8b027e89acfcd0c8878295ee2964e6e909c0b49fa97e2a097d7abf

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