Malicious PDF — malware analysis report

Static analysis result for SHA-256 378deba03b7d77a9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 12:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e46aebe335595234ada6f65d90c50d77 SHA-1: cc9c4681bc3c0c500b8d4830f2476313dbfda4b5 SHA-256: 378deba03b7d77a90f9171e32855a04095d89e1735ae1d0251cb5b118098bf59
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate this PDF is a link farm and has been flagged by ML classifiers and ClamAV as malicious, likely a phishing or trojan delivery mechanism. The embedded URLs are the primary indicators of compromise, facilitating the potential download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f2840646f7f159d125d19c78a66a95d2/vunuso.pdf In PDF document text
    • http://munsusa.org/userfiles/file/20210528033238.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/86296523755.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/bf43b5b3af88b24704acf29007d08773/veroguzare.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sefobebudapexojinup.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16204359390678.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/wofaxilas.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/906b942eb92bb296006c1d607e2773b8/panukifitokozawem.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/at5mupn9vs9i4lhp05bdlc7i2a/megizedisizadulasib.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/kitinazonaxok.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/lalipodinapividubaf.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/25336881102e66461d9d3df07e23af55/zatutigaxonekatinedib.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/tutijodubisuvuxasumok.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/72268779262.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821be80528a---75769853666.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/jonije.pdfIn PDF document text
    • http://bptramptour.pl/files/file/31673579361.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/lolenuwawefoxir.pdfIn PDF document text
    • https://dhesient.com/media/wetereludisimosiwudigoba.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/14104294596.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/897mcnshjngir42ko2lu29objo/55101903676.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugubigavenuvufupedukolix.pdfIn PDF document text
    • http://tms-operation.com/upload/files/ridodebixofotaputakuzowi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nlc8q3pubse2uq6hphfmk0t1g5/19171740982.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c176bd132923102bd2efe2ab80c02038/tumerelilozilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acer+aspire+5532+service+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_off0000c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 16632 bytes
SHA-256: 02d68b2d856597e3e5c3789becf5242f149051cddee7f2f957c0bfaadd38bbc7
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 11136 bytes
SHA-256: b213ea4a72a1e88d241d1fabbfcba899305ae353582548167f423f6128afdd97

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