Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1440fcba90c841…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 06:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddcfb96b989aa63df05b3bd87439bcbf SHA-1: 7ee6f5313b2c80bc03b1f0fbd75b1639fab6a506 SHA-256: fd1440fcba90c841b726e33c29634796cd3ae83f36ffda738d747a862b0dfb2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure indicate a likely attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://unicaconsultoriarh.com/images/files/timunegebesiv.pdf In PDF document text
    • https://trimix.bg/UserFiles/File/83177406843.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/6105095980.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0faabd43---14825543611.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/tuvumutijedazefu.pdfIn PDF document text
    • https://mlspoland.co/files/file/68314401610.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210603014642.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161032185e5d8e---66678341176.pdfIn PDF document text
    • https://autoparkalbanese.it/file/37899387051.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/fogolememizine.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab22d467953---vibos.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/92620812858.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/82362763362.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/vuloponiwilofegiborajen.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/xinuxiboduveporimeka.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/josijofelo.pdfIn PDF document text
    • http://balone.net/_upload/file///8953987459.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/15407069023.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93951839d8---fuboridufiveta.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/fcf04a9d7564c35e406782673ee7e8f1/rubagurukesebal.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/f44s543bmu5aohrprujffgdqispteeo5/komanedujevevavopepo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0d754967---83934163174.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vijedirafuxijovisizerejof.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb97b9481---gijapojivanuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+crazy+loom+bracelets+with+your+fingersPDF 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_off0000b792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB792 15444 bytes
SHA-256: 0eab3102fb290380ddf9f07273b3fe03c08dd465f67bc28b9769e2d22184bf99
font_01_sfnt_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 11364 bytes
SHA-256: be1365b3db9c1d2d2e9822ae2d5710f28318433648a546e0afcf8ad7c3268689

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