Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db08c0eb2d26a31…

MALICIOUS

PDF

78.1 KB Created: 2021-06-13 00:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8e11a39b8742216109096ba02bc8d871 SHA-1: 4e7517649a87d9686cf9120907440ad3a1213372 SHA-256: 2db08c0eb2d26a311358b1c3fc0e2c122fee0e3f398efba3bbe0c4877eda2b04
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=get+free+tiktok+likes+without+verification' in one URL indicates a potential social engineering lure. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=get+free+tiktok+likes+without+verification PDF link annotation
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/3ajpal07eajm247g72234vcbe0/7117320190.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/do32g2ad04o6aso6jfq3qe7h4i/21460119908.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097dcf06fb8a---mexamodaronezewi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427139117a---41075453477.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051004055473499.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c30f99d8229---xaminewekugumoxobalaxog.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/lokimuwufofu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ae2320066d151810c295b44fa067fc83/92352078980.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fokesikalexanuf.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aaae928c2---45002365406.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/sejatu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/3474194646.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/9808441963.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e41f22352---47462323820.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/58086944669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5216 bytes
SHA-256: 34d7d9e145e30826145718334ffcbc2a964831bd0c7e1568da7141063bfc2d5a
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 2448 bytes
SHA-256: fb18ddbd6cee2aaf7dfd9b1844115e93291871ef168f125cd05d4c99464513b5
font_02_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 11188 bytes
SHA-256: 0dc1c942ccd2a4a0103993fe36510852c859669a7596af0cc983c2ea9500085c

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