Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afefa0265fea8b9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 13:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b70ebd6c0651e734aed89dfa6485cd0e SHA-1: b38bbeb798899de5c34d6f19886408a24322379f SHA-256: 4afefa0265fea8b9957e31fe03b26492582e9e01d2aa1eda224a350ab5f471a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://agcslohian.com/userfiles/file/jelujatixap.pdf In PDF document text
    • http://tw-jia.com/uploads/files/202109060853174662.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f128e60fb37d8e10c469f6ed70ef5df7/latifijeguwemojoxepuzuk.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/210f0cb14776daba567ef9b9a4df1c43/kureruxep.pdfIn PDF document text
    • http://elitacasa.it/images/file/levudubulumutojifaxib.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a91eafcb---21405906808.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/61803712479.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118371acaa---59751136899.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/64285792982.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/43445596701.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/95037307212.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac315cc05---66668184904.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/25522555669.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a3de2755---busovajijitoj.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a3b3c2e4---wititijexekolusetiwavejed.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/84756066191.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407dbb6da10---juwewosonelin.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/fibisaxebuwavaraneliseku.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/peripovedapagezarilep.pdfIn PDF document text
    • https://sim2007.com/files/zutafus.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jabexumilapumixudok.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/14260341280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=8+ball+pool+100+million+coinsPDF 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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 17620 bytes
SHA-256: b766111f214e7a43ac6a46d71824ba22ff9d9fe03f33de9d4bd2841363745c8d
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10628 bytes
SHA-256: 3fec855362fc3ac51310bbc25dee9fa7f7ac47a07c8e90d2fe349d4866d48c2b

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