Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a075ee82b4cc767…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 17:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 470d6cc5ea1535878f02114e9ca99314 SHA-1: 65c17f89124bdb51bf70b974bec5f4032a855198 SHA-256: 5a075ee82b4cc767ff5905d6086f17430741769a375d6e4f0778a4a1554d2066
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many hosted on disposable domains or compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nemeckystrakac.sk/editor_uploads/files/99084029005.pdf In PDF document text
    • http://bogelaipigeon.com/upload/file/mexafapidubinijusanifujax.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/97434690457.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/bufidewozolunuwoza.pdfIn PDF document text
    • https://doitoutdoorz.com/file/CqIEgze0irjwfzXT.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/pudibileti.pdfIn PDF document text
    • https://luminex.pl/upload/file/25835226744.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108201923305542.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/39544679296.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/m0ccm6acu940cr92ehhr4mvfbc/bavobefusomuf.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///257036636.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nugovigulaposifuti.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/saxuzuku.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/1214363912.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59ed83311---luxururinoniseri.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/60545017468.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ccb9ab642---sujoledogipibalivakugow.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/gelenatagatemezinab.pdfIn PDF document text
    • http://balone.net/_upload/file///womozowavovejiw.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/94570449479.pdfIn PDF document text
    • https://airshow-bg.com/file/bufewupinuvujuxenitefupen.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/90617119671.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/968214155.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/8564608282.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/264f5074378b4e38c2d2c6315fd5f113/bezolerete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=a+doll%27s+house+by+henrik+ibsen+pdf+downloadPDF 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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 17612 bytes
SHA-256: d3341c1e579806c9cd4232590db08152168f0ffdc96ddc857f7c8063a8edfb9e
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 11044 bytes
SHA-256: 1507cd7aee4f60a11b8175a57b8613ae1f6cfae7848ba3b7ac4558d4869d3148