Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa74ac6e5cf4b64…

MALICIOUS

PDF

79.7 KB Created: 2021-07-18 00:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f538f43492fc66c17e5e1c1c8f80e420 SHA-1: 895b5165e936ffd6ec2aeca7c4910cb73dc15fe4 SHA-256: 9aa74ac6e5cf4b644d7d8fde92352da5d2298577a3e933624bbff070f7a3dcce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5932

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://salvamontbihor.ro/app/webroot/files/userfiles/files/sefiraditeroma.pdf In PDF document text
    • https://weddingitaly.jp/images/file/ridaraxijak.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0be50429e---bixelakedog.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/vejitefofuxijupekogubufo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/68341251931.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953dbdab90e---90171765354.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286c17875e---11370588743.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e159971f4---1309736808.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mixoborex.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/64704326331.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/fenogasiletajasunib.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zowaxadikapeku.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/84783336082.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wakomiritotojajude.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/7250091698.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/vifufejomed.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/938eb6ab6f6a9053ce7ff3081cda7c38/26382965521.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worojif.pdfIn PDF document text
    • http://dges.in/userfiles/file/20598630158.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160921c8e06bd8---ziwugiwedux.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pozob.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tmbpvs47npivvn72brcng0q7u3/zuforefanasukibed.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f12f323ca---disesanewuvuxusevonexon.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd0a6d8b1---76131629272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=decomposers+of+pond+ecosystemPDF link annotation
    • 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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10596 bytes
SHA-256: e49860883a6ee0585586ec4b218514d478876e0685175e170c14a81d001472df
font_02_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 16356 bytes
SHA-256: 034c162f86ebc961a90fd0f83aaf3d118c7b35f718325239472a0a8c821a58a1

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