Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bb003171dc11d5…

MALICIOUS

PDF

94.5 KB Created: 2021-08-07 13:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 3238624f227475903973e86a6df615f4 SHA-1: e100d0771405c23335b65f4dedf30b606233aa90 SHA-256: 07bb003171dc11d57f9ba6a076dc7e702c63bbc1dda4b0b9fc85fafaed7807c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware-hosting pages, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mfahk.com/upload/files/gavogimilojubo.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2b14cba1---titiv.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sogaxodanoguwinef.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dmoo2dl26bciaf1v5m84pp7s42/lubodulakinamexapamuwuno.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e239aefdc28fa22921de18834ead79be/14307621494.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/verodawurajafokogun.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/42520944519.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k7st9ai7ppp47me0h6qk9irs47/lezixoge.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/29246012424.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2a25e29c7f169da4e5447c08bae0dc15/menenubazotukuvu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/295721baa02037f4a24a3d0614ad797e/rodoxaxixafi.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/29304181108.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5752ea95da36f468d4f4ef141c1d5864/97018570542.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/03fe9a100c2e500ae7ac759976a4d6df/xotizezeni.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/48190953821.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4403074a52---6505283939.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/945825291610dda677b3f3.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a283c309054---9809450283.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sotawudofumoxuridogaji.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed07882ef5---gomekedukisavudedupamimuk.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/98dae8ab762e378ad7edfe964845620f/99096691129.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16108538f4c26e---resasazamujelujopazuga.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/padegegijet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+guidestar+for+nonprofitsPDF 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_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10824 bytes
SHA-256: 416a2587fea49f9f209f1640c2940f7726d74182f7f83a5e8183a1339a9494f1
font_01_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 18912 bytes
SHA-256: 14777704c4254ac1af199a33e49a8e2aeedc2c73abb2a443a610844bd0c33b4c

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