Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bac85a72951808…

MALICIOUS

PDF

119.2 KB Created: 2021-07-02 01:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33bed09a6095c6c31448d164beb97012 SHA-1: 078dcaa47c390f2c12c870e5462411b14c23e056 SHA-256: 11bac85a72951808cbba1ba2f5640ef0db52a5c6ecbac3e8f2ae5f1a093b65e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to lead users to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5502456e1---17135864836.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bea7d6a93125e224703801f4c9f47e42/26186807840.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6lrna35mjjeqsnlhdt3glmb8e4/20443829946.pdf
    • https://defaico.com/d/files/88630515286.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/95828785372.pdf
    • https://srmhospitalities.com/images/bulk_images/files/61347734442.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccdb142b5---nejenedaluvun.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/scapb9hqj25ogdv2pco0874roi/9588709382.pdf
    • http://zkojicin.cz/userfiles/file/7607479998.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d5oivvq71cvk08lcfgpqkd2kr6/tetoxipoxafef.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7957637585---43114893203.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090468fb1795---78398308178.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2r406m88k9oscennsmet85h18h/muxafuwokes.pdf
    • http://adabaskimerkezi.com/upload/file/sopudeju.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8de0f2b7c---tejarabuxidasomuxasikad.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aff48d076da---xaruz.pdf
    • http://www.look4job.gr/images/_user_na/file/16488770209.pdf
    • https://bbpartner.cz/userfiles/file/38205026693.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sabavetedegededimokoto.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e930b15559---458669440.pdf
    • http://happinessgown.com/upload/users/files/99690502558.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/22456500723.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fr4ald8hkqopj73ul7qtjgfm3j/liwobipunomesewavexewen.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071628bc9f3d---19808993489.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61cc0e5e17---bawimiwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=implement+meaning+in+arabic
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00015580.bin
09aae6d7b0cb95642065174f7f0ed026a0cf06b9a61d638b922aee303206835f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15580 17860 bytes
font_01_sfnt_off0001713c.bin
6f734fcf58b5ffd67bb590931d2f9300b27a36fe89844a64b0315de06c60f04a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1713C 17844 bytes
font_02_sfnt_off00019f5b.bin
d3cf57ea28b193db77e827751d3238f862444367d26bbfb387a567256878c22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F5B 10520 bytes
font_03_sfnt_off0001b6fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6FD 16792 bytes