Malicious PDF — malware analysis report

Static analysis result for SHA-256 6252818e34c0cab0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-24 05:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dfbdabef94a8eefad3d54c9b5f584bc1 SHA-1: 595717b247930b673073ce28d2e373aa1c1ae031 SHA-256: 6252818e34c0cab0b27d6c92cd2367d5f9e4cac1286a6a99c663ce2fad751459
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to direct users to potentially harmful content. The presence of these links suggests an attempt to lure users to external sites, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed1b64a25---61677975899.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102d1ac0326d---67930135809.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec849ddc67e3427414ed673c2e6046b8/pebokoxuvewax.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/41011777199.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/76281374941.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0ba21e015ea67954a4d19e41be7443d6/5756099470.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd90d56f0f9---jisoloxo.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/90861587812.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210723124526_18g2oh.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d7a77tkhepim2nroqb51vratfi/dakokalodusil.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/kuvukuzibefonerugibibutu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e5e38a31---dutaxizelozamir.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a444d357c---mawetusupakepirixun.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4d47ad378e3bf01939323c1e50907e/79864279645.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tufuxigaweg.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5e8dd73a---72275803957.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/82e6328fa7e6860aec16d59c055fc6f7/95588087882.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/duxefa.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gdnnp0c8ssv1ramqvjk9vfvs72/jezadumafata.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/wovefumubabezividumuzel.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c4ab37167c1935650198a3b1051d93f1/tokimesizuvilujoniw.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6eb45d29ccdba3f5aabb0f66e1e3d2dc/64934673410.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc838146d1---leliwojodefa.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0de824c80fefb1febf73ea743bd147eb/koporujijemaganixodutaxa.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lutesarinijazelemofufur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pinata+trouble+in+paradisePDF 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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 17336 bytes
SHA-256: 989315ba8c49f9ed4141767fa667308a8a3c24fe296436bd4de5439225e987fc
font_01_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 10628 bytes
SHA-256: 48b0b32dc6d1322ab99b997761e6017c71c00db7811fa40a81a5d306fa03bf00