Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0861322033a6c1…

MALICIOUS

PDF

98.7 KB Created: 2021-06-25 12:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bceca3a81898fabdfc967fb4347151eb SHA-1: 7af98e053292a141f3798394899b1e211a5229b1 SHA-256: 5c0861322033a6c1324f8693db0d09c052a10ee164789a5293d725cef8af8a28
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of numerous unknown URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701283b3ce2---basikovirulusefidenogom.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0ba623ec1---21316098334.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0f626230603a3ebf71723d32ac425d50/95262224340.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2dec2539a7444c76d86213eae60654c0/85243828077.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a6a66ab5---21214142659.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/40a8b9c28234f5298c523b8ec5fa3f23/munifek.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6963c95bec6a2ed26047ecbe14e8a8e8/41725859804.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a321b28ebb0---tefafosezadefugotewufopuw.pdf
    • https://medtek.vn/storage/file/21161838919.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959f974ef3---50728290695.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/12ff41d215b28470cc86898526c65183/zivofovabufepejojog.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8f4dbb89---kixofobijofe.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/212f0260013a85988176ac762a04779f/77803953.pdf
    • https://likeevent.it/writable/public/userfiles/file/63459147337.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/7ro8khfgkvs8irnb5e8rhvmh07/xaparize.pdf
    • https://vieclamhanoi247.com/upload/files/vufazaluxewolewoza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+mother+at+66+class+12+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e8c.bin
2ccd5075688c52f03b6d868e18e5c7e80d53d3b694aa194d95ee9a5c8a88485e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 17056 bytes
font_01_sfnt_off00014ac0.bin
99c95ccc8b882d3c10c9374dbdfe6d846787bc5c31433af7cd94e1ab2c2cab23
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC0 11412 bytes
font_02_sfnt_off00016586.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16586 16792 bytes