Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1806d4e6d9f6e3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 06:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f12473745b47f5bdbe1c75f4cf250ff SHA-1: 0654cfe6990156d2ee8cabae5f67a08e1c42ee8e SHA-256: ac1806d4e6d9f6e3faee62299a0beabb98c07584ea3d7b37a09cdcb28f4ed0a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rainbowcaterers.in/userfiles/file/85966782629.pdf In PDF document text
    • http://edumedcare.pl/upload/files/30858387920.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/97941563333.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/41689417544.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210605113655.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/9239567878.pdfIn PDF document text
    • https://businesslife.com/content/file/7557565198.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/69975417600.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/jivafi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/dejiwexufemib.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/lobajomupulavovekinij.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ovanewobolupedabigolek.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/05f0a67c82e2941e1dc7e24addb3e11e/57434662387.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/26982758544.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/zinaroxitifilo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/56571174750.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4u1a1ts79m1idufe6ln6lj88r2/22162722766.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/52485976620.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/noroxam.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef94c7d9fc---wodemirubopojuxibi.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kojofamakomapuxamavimuf.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/robufubugajifuse.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/79c92a0141c60793d98ae4c51fdc7e98/donuzevadowiziworebadude.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/xofaleredorekiponigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=warlord+gear+for+honorPDF 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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 19160 bytes
SHA-256: 50e58656aa53d4dc868ac560a142df7b511e42cf84db2b9243af774612182ec1
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 10268 bytes
SHA-256: 5e301dbb18fe406732f8792adb0f20d2b60a5642067a80052cd1fe5601e6e7ec

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