Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c561b3139799c16…

MALICIOUS

PDF

79.6 KB Created: 2021-08-16 21:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 055c2fc6dfb2ed8795e6ac7b312b54c6 SHA-1: a3a3fa8d9c9011b77e5853812d6ba22cb0162123 SHA-256: 0c561b3139799c16c02b4be6c8941131f9230b01346ea0cfbc0674397d1f76c1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to external sites. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs point to domains that are either compromised or hosted on disposable infrastructure, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=marmol+es+aguda+llana+o+esdrujula PDF link annotation
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/57764940621.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/81709256891.pdfIn PDF document text
    • http://wenxuezj.com/images/File/lozaz.pdfIn PDF document text
    • https://schmitz.cz/res/file/terijoxinupakibutux.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/egbctacrhb6ikk55fm2c74irt6/gomom.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/bodabatotagelemafoxodutu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/mibubunowimirenoferona.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r026ot7h99tvfi3u24ud6n46th/79154656292.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161184f6b75de9---netuzafokajafifipeki.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/20178940375.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/folivapekukonufavizok.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/16347150765.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/falizuxonugosigexogaxo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jgc3rbl0b6ibsedpgrj378oj35/mosidujekitebajivaj.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/zalematirowunokewuwelefo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5ebb2b3d---17278924069.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winogedazukejimak.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/73074126371.pdfIn PDF document text
    • http://geose.ru/userfiles/file/tikozademew.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfaec86449---3305547851.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/bofaraguvigulobabi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e643706fd56---58701155990.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a99524cf---50389683431.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2264b5ca6efe99c653ca8f60f0f404fe/mifefudureri.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/63763289970.pdfIn PDF document text
    • 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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 10624 bytes
SHA-256: 876f3f928c2b5fae8d93e58e0bd3c6b1220b0f9a66f745eecd4c7fdc24797853
font_01_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 17664 bytes
SHA-256: 118486c6c10db3653e28de4aedfa5fc864a38500b804864f424a492e6e4d518b
font_02_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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