Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290bd552a2bcd92…

MALICIOUS

PDF

84.3 KB Created: 2021-07-18 12:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d6ea24a01c53dd56b031341e5a273e9 SHA-1: d0886267167041a27d2e8812cceb4eeb6bffec70 SHA-256: 8290bd552a2bcd9273d3e6ca10e6556ee8989323ceb0d22904cb4327fb7bc789
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and a raw IP address in links indicates an attempt to lead users to potentially harmful destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d06e268e655addc57c4f7cfbdaa7701a/xevobasajagidofawobuvi.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9ae6d60bc25496c6a81feb8478fdf75b/57857687827.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210702_005311.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a786d06ed6b---nediva.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e556925dd---mupeladawizotezinimokor.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b81f477bcc9a0198b3b9ae3e660aada8/78615507424.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac90eb70d---48207844109.pdf
    • http://jrpst.pl/userfiles/file/8495360224.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/73199838190.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/85764495881.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7a9b503c---jajabupekotatidupafudawus.pdf
    • http://kokalietudarbnica.lv/files/files/rutokejomilukobakilunejig.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4541684863667d9cfc293bab5706f0eb/88045923541.pdf
    • http://abwnickersonplaza.com/uploads/files/tunabadozasizibipudibiziw.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e195ebe30f483fbd3ca95935f6a51aa9/mowazilenale.pdf
    • https://247hvac.ca/fabulous1/uploads/files/98930313149.pdf
    • https://iword.de/userfiles/file/dibapunub.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512002642677953.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609decec04cb8---86079554000.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd2c210ab---1110416268.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16088287724fce---wemisabimenafu.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b999f6bcdb4---53692929300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=peritubal+adhesions+meaning
    • 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_off0000e5d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
font_01_sfnt_off0000fdec.bin
c28f9b35a51d3dd4eea6abd76cd715a3d9b0c92d31b8daaa3638892a9a4f6f12
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10936 bytes
font_02_sfnt_off000116d2.bin
9d65cd338fd4311a1e08019e1742878546f8fa637f28591bf0f2baf5894c0f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 17336 bytes