Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e2f159f745b6bc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 21:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a5eb7dddacf7f5277bea097815fb832 SHA-1: 114f8a90ddc340d6e0e5b51e6e0601caea167363 SHA-256: a4e2f159f745b6bc62f8c584412c4f6b44d4ae4c76f757b2882768ea0952ea7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to PDF files hosted on various domains, some of which are identified as compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://askisan.com/upload/ckfinder/files/gitegugunamiluzurizisove.pdf In PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/wivanowadotowezizededu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/75658032365.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/pumasezuka.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161429ad27b15b---75074719494.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/vufenetapenuxidu.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/xavewan.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/galuzegewemotusiwus.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/votevigepu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/folemug.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/romobigasujowiwulu.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/sofowidejezomujiperopo.pdfIn PDF document text
    • http://hainfelderteich.at/38393718540.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/zafajenowuxajefojomanu.pdfIn PDF document text
    • https://suruburi.net/mm/file/bixazofigivena.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/62664111610.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/53402259530.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/41783163211.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613666551793b---tugamerebiguduzodage.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/90599952162.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613044477850d---26178412725.pdfIn PDF document text
    • https://windscrm.net/files/file/renodirif.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/fopiberivinolono.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909122647736464.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/2341618753.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/78251699826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+spiral+2021+online+free+123PDF 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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 14540 bytes
SHA-256: 48d8c6f445e34cd2c48bd6e93e1ed2924385ed16979c0808e03e0112ba369aca
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 11036 bytes
SHA-256: 69186dac81c56603374fd4fa5df0aae9bc68580dfb38d7fc6d9b764b29fc6ffd
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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