Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30ef1527efa0d6c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 04:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66dbac011a91a96c6ac849c75bfe61ea SHA-1: e493ada8a5a2cf01b3dd2ef330ef16169252f0d7 SHA-256: f30ef1527efa0d6c52c0f039ccfa7075cc5874bda1709eb88f205935e4e1cdcf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the use of compromised CMS uploads and disposable hosting, points towards an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nextgt.eu/uploads/file/17566938604.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc33291a7---wodosuriremizibopunosonur.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/68021679582.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/9368226688.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lesoxudodejetijarowabatok.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/44590032450.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4ae1714a0b609ee3a300150be0ee5d85/25188121301.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vanikowu.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/61453058703.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/79240197352.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0435ba7d1---13324365500.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/juralakujuvivazopilekexa.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/digigonelo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d110598553e0f4cae3c009827879d972/denitivudulisovunojiji.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2a165a3de---5639881236.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/82239066685.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6c00a478---xejasa.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/laduwivefape.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/16032458094.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c427968f9---pewanusudogo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3be58b9a516b808ecf42d844a2a2750f/lonojewezabuj.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/42693230910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solidworks+2016+training+manual+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_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 11524 bytes
SHA-256: f0a64dd4007cf3295ce6d1ceceb82270d9c6f327c5e4d6e4c79aac8ef3d610ee
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16304 bytes
SHA-256: 27c1ba3ff3564b8404796a0eaaaca883de8df6bf61de37a14ae6c9cdf64b9384
font_02_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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