Malicious PDF — malware analysis report

Static analysis result for SHA-256 88151bfb17ff3b2b…

MALICIOUS

PDF

75.0 KB Created: 2021-08-22 05:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38b6553d8894cd1ef42bb328669e0961 SHA-1: 1798b9d49e6aa26d7edf4d6feedd68087121cc85 SHA-256: 88151bfb17ff3b2b77c4168d1831ddb3687cfa2c5461af9f3160671b09aedfc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/tih779ke8869j70hkr521kfk17/45356399428.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ab54a73---xapamibewunapakijiganinek.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/39478123938.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a230350da0---7399873929.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071982a6ef5e---kamakederenumesaleno.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/79230122571.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/11095b9223aa4dcacf7680511693d35e/61396455375.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb9fa2b51---dupevu.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/58764141214.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xodivepatige.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/denalorudixe.pdfIn PDF document text
    • http://chikatere.com/Upload/files/vifutiwiru.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/sevesabufud.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/56196148900.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e467e224f3---fateg.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/afab352088fd7bcec6ca1dfeb47c571c/29735340400.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a39d407a---75361173577.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a460861f---wumijezawuruzidixuduxo.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/daniwaz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f662a7937f---javavulexavatixisurisefaj.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5b562fd8aa53fc17cb3ef7f30930b231/96926770584.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/90080980791.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/tisovipotadenevit.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/kovazevidala.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/belitetadaxerupaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+love+sad+whatsapp+status+video+download+mp4PDF 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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 10848 bytes
SHA-256: b5fd65768c5833656cdc407749909f81cc77974966db26df1b6c3082f3753eb8
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 16112 bytes
SHA-256: e7ffa92a9567e2cf5a885e6cc2f1143ea53118716356c4b583f75a6d76a59b12