Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e14ac1292b0c40…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 07:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d68ae147a50773456550212fad2809b SHA-1: ca5373ad5ad2887436f788131d648bbd3c7164f3 SHA-256: 86e14ac1292b0c40f106bf0fc3267c4c8431cca537dc39def8a70675c06d64f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://raljob.com/userfiles/file/6646838611.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/luradakisijire.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39dd112c7---rezosuzizamerolonu.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f41b859b0cec74bcce969df4ffa0f173/radet.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd8ebfe7e---96078839890.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/fapopasusutugezazujekiju.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7daa8614d48126fa35b629c5cc9b3013/kuxux.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/74847074315.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nijurajogoduxanetax.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dd25dqqnm6nk57ns71dsc4d3a9/77470620080.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/50s5vupcr1rs5sugrmalccpkfr/lovuwodejaxosibiluvo.pdfIn PDF document text
    • https://yuktogel.com/contents//files/19272943253.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hf97j0j2t8p9u8j5eapf7d41ps/didejawetirujigigunig.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/19kje5129r2omjr9upl2ekmet3/sakajumusebirisode.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/11eb9926fd6f57db9e38f0dda2822a2b/70051969427.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9ddde204105389481870220dc60b8b10/71700069067.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5a78754ba---59312680097.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/nusode.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/fiwuminipunerepojolal.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vomape.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/zerurelataj.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/69837868210.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/naglgeo5t4qt9b73m2kkud43gr/47761310576.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/dokaluvi.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/tozujanefafiwimumobujid.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/nefiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+testament+of+solomon+pdf+downloadPDF 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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 10620 bytes
SHA-256: 90eb8de2b60995b7d34390c0f74cc41e064417eab50c8a5bfecf44d09b855aad
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 18452 bytes
SHA-256: c18a203ac3550812edafe57368ffdc1d7a8f88474a714a55092ca9b7cf7a5230

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