Malicious PDF — malware analysis report

Static analysis result for SHA-256 819577cde87c8744…

MALICIOUS

PDF

89.7 KB Created: 2021-09-07 03:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40d13411662b8f3c2acbe8f2be1e0823 SHA-1: 233dcdcb6a27b1c2c7065a782b1422671d8a023f SHA-256: 819577cde87c87442949ef3cb2e1aaf1b23c0186e828f114f4daf455e1bfc545
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.supair-lux.hu/ckfinder/userfiles/files/90025673952.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pijivusabarifoburarimaf.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be84abd8807---72804718406.pdfIn PDF document text
    • https://badoza.net/userfiles/file/10227829963.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t6kou52j4b5oifd32b847i7hcf/53480351924.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b227644ee6a---39118819565.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/zurusog.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/zujinon.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca6a703e4---sotimukisimeziwip.pdfIn PDF document text
    • http://jarosi.hu/files/file/tikoni.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6faf55a9d7---degozujoze.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096001f4d23e---zajafufidovurorodoxurelak.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/91330369813.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1e1622abf5e6845d083477643ca6e285/mefotebonero.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e870108c331da24be607d6899bf128ca/vulitemexovamu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/solafalu.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/75424728638.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/lemipipufebatirulegox.pdfIn PDF document text
    • https://datajournonepal.org/files/zuxiduvakisixefage.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3534d59c59---birefesuji.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a519fa6c6d9be4cdd65b2d5f616e0682/pafalemukefovesinatipeje.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1060949cf---megaxitiludifilijavoraba.pdfIn PDF document text
    • https://iohrp.org/f_files/files/remaliwevezesovudugojo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/bipixegobigoxab.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/554404fac64e67b50afe98fc271ad7a2/varoloviwurudes.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/saukrc6nfo1n4sn346ilplpc0n/53532924843.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/tonoputojaxibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+compress+pdf+file+in+adobe+acrobat+professionalPDF 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_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 18156 bytes
SHA-256: e3ef79aa3aea08d488ead06a101fb6d2652627a8467a1167f43f0cc5a0c18177
font_02_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 10996 bytes
SHA-256: cdcbfd262ff2a057cb47f6443ffefe2e6be7ffce236694da2aad11384e1a0fc7

Open this report in the interactive analyzer, or submit your own file for analysis.