Malicious PDF — malware analysis report

Static analysis result for SHA-256 3978c1e2dcb95b55…

MALICIOUS

PDF

92.7 KB Created: 2021-07-06 06:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87988b45a42fdf26e83b034f4607d2b5 SHA-1: f991197f696811da37068f3a6e91eb244b609311 SHA-256: 3978c1e2dcb95b55120c1b6b5602ce3d5ac930f6a3eb715a89f5aa7b98e16527
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites hosted on compromised Content Management System (CMS) upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/4um3jvg7ik1sk396t01kag5s34/8732668434.pdf In PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/muxavutabirafinokagiva.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0bfbd1ab9---venebapokazovuwerodor.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/76396511385.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb26b8e039---vonututomufamo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd77698036---momesimoxijinofe.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/58432373043.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/tukelupolamexopobifejuxan.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b103bd1f9b8---peroterosorusasowobofit.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c345860afa3---73090134721.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8d52781e---radavavanezidolejova.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/wexovopanipobefibezul.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6jgmrkkc3sj2h9sfioq1stpm7p/tinuduponezugetebewokoga.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7d97bdbb82de45581918503d9467abbe/pabizepulikokipepimadomaz.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/97874596390.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/34807502969.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/ralos.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ebb78ef39---tofilekuwukitikajag.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072465580ff5---54426432883.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d01a53fb01---favakusolotodemorepawo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2h8t6qcf7ob34153a6foije6dg/76123508838.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mifemipaturawizobuses.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/24651101541.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/616191ffddd6d3c78a2e2b54660d03eb/50782365256.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba02ed175---10777586142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+does+open+university+meanPDF 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_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16616 bytes
SHA-256: 92818c4f8fc0eacadafc762aefbb55bafd31008d2b98ba5f015d7d126f0eb93f
font_01_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C29 10884 bytes
SHA-256: d340f3bdc00a559185fc2886f096e9aba19fec7c4b094dd3fed1521a435b39e3