Malicious PDF — malware analysis report

Static analysis result for SHA-256 753d38134cb39648…

MALICIOUS

PDF

96.4 KB Created: 2021-09-23 02:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 205d6750161fd887e1a10067e2b215c0 SHA-1: 6bf0844e1b7003a32880017df9ab85ed1f488561 SHA-256: 753d38134cb39648161c2a8145b55ac9752782acbba5c5fba298d8dffa56267f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to external URLs for phishing or further payload delivery. The numerous external URLs, many hosted on disposable domains or compromised sites, reinforce the phishing and malicious distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://colantuono.it/userfiles/files/vumixotuvimigesesodikepu.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b444cfca---dedabebokibusolibofo.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/72252199701.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210910022629.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lozulagonek.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/542ce20f84b288fce29be56c0248907b/70380558296.pdfIn PDF document text
    • http://it-hair.com/userfiles/nagamelepupigefilivedi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/mutotulutotesixemokilozi.pdfIn PDF document text
    • https://parc-hotel.info/file/91867311620.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/fekexuberavudupi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/65428375338.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/63309399842.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/somenedizugi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/sobewetugadutedazexu.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/42714360685.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/rutijalawu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lovesofaximunijatebevoti.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aec6b012c1---79265230078.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/106904107.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/kaxotakamawozazatew.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/26161028493.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/84993608756.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/4343750577.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/kunaxudizimexorogu.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/lixofu.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/kagemedimazosusumer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=auto+followers+instagram+10000+freePDF 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_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 18556 bytes
SHA-256: 23cf8cc997a8c077f1d907b3419b29e2314841f9b30eab7c1b331b55b9f471da
font_02_sfnt_off000159e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E3 10896 bytes
SHA-256: 8776bb8b21bb646347d019dd75b59ec4dd582dbc2db0d8b5882b171f40aa5a1d

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