Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f233f82e3c2ab8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 10:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 046d1124d135f18eeebedf60382adc1a SHA-1: 4e2114b0952cd8315e529ace6ba05a1d19e4b7a4 SHA-256: 78f233f82e3c2ab8b1a0ce6f975cadbc015f82c2abd8d59ee5592530683525ac
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://arcomproltd.com/userfiles/file/tosewifupevegixasanedi.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a2fae304---27662443720.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074521cd0bd2---nejez.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/45083754269.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/zusetilopatufegipava.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/97500312.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609181153e501---mimudubi.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/56482909102.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2a0180242---redipuguwuripo.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///39297741716.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5bdd0c0867fdde424552c412eb1d50c/gofovixelek.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a0bddde3---31014305526.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/96106979024.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/888568176e8bf2bf50c5cc613ccbd0e1/wepexorogokaloze.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e84af77828---gusoba.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/pne5dd65rqkta5g9s7h3on22j3/mireweroxedekabidafiza.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/poxuvezemixodakodudi.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/suzevix.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6432831570b91782a711c05fe8e68c0a/15926265676.pdfIn PDF document text
    • http://winso.tw/userfiles/file/dijotufuzawiwo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5q2uh48huvbk8gq83mqm1c51ul/xamajax.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd32f3b17---73007693395.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262ee43ee0a---28128962770.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/68881495119.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ac76ae11---jalejexi.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210718205040.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/toraruzosuromanabamaketis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=retain+possession+meaningPDF 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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 10492 bytes
SHA-256: 892ad9e99dfe52ed15f97d1421b47c394737a9f116264bc8f80d9c7e1de3f086
font_01_sfnt_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 17672 bytes
SHA-256: dc782e25ee9b2e618863828e01748cbc10c7c17ee2dfcdf2aa631b4590f1d338
font_02_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1