Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9a8b4577f1ea09…

MALICIOUS

PDF

77.1 KB Created: 2021-07-02 10:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ad8e5d933a67e275edbe4e44cd43741 SHA-1: e7ad98017ea93f4d6c7cd4d064af2553107e4a5b SHA-256: fc9a8b4577f1ea09b89df6c0f97b70f68ba17190dacb9ed71159cf533efb1bfc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS platforms suggests an attempt to obscure the ultimate destination and leverage trusted domains for initial distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb676fbb1---bosumososijafidafilijef.pdf In PDF document text
    • http://apluskleaning.com/admin/images/file/67111702462.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/78393029858.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gelepiwiviparigumumuzazef.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210523170857.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/45641773407.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3keu2cdi41ssjsacnm252b12gk/7697416230.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/80556186222.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/07623529a2bc51e36764f92e00dbae7f/39944162611.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/bp5rugccmtj4s3qcfabb74v6ue/92743424500.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/84389919861.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/pifarewafapa.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae2aece07---82080907747.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jftld5kd98q44potc5vf8te1o5/56831087909.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7431dd6f---jaxerepowexikofos.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72e69ecb---71773690813.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1c18bd1baf7977fe07a788f530e7df14/27613090903.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/41025992279.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/figadipijotepazukot.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/13933742715.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/gokepeza.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607422671ac0d---84889838981.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/dad5ca4de114a216e2722e094988a7e5/63123282373.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/zoxosabiwe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160926adfadc8e---56512497634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=convert+1.5+kg+to+pounds+and+ouncesPDF 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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 17272 bytes
SHA-256: a56de0d7849a8ab14ad7467c6d77c0fdfec9deb1f8b183732d717d03f1f66752
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 11092 bytes
SHA-256: 4290a4eacb3029d1090a46bd94e2890d5e394a7b05848abf62f43c8dc283d9ef

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