Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95544ec4a674c8b…

MALICIOUS

PDF

94.5 KB Created: 2021-07-16 08:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22956ed3fbd8894cbd14742127e70871 SHA-1: f241a71a2fbc8f8f5582593c0a9a7eea95055215 SHA-256: d95544ec4a674c8bb2d37ed4416d45b04274d52eb4d8b98a1a42de708888c4ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=financial+aid+and+scholarships+texas+state PDF link annotation
    • http://polymer-optix.de/userfiles/file/lepetutedawifadevafibi.pdfIn PDF document text
    • https://cristalensi.com/public/File/22275104183.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/38995ef38ebdd02fe5dcff2a86729abc/60820305930.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/bgjj923u0183mf96k58df7sus8/nagupot.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50deadb8c51c0da869b83152c20c155e/36775919380.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0dd23f9c3---sojixizefa.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853451e8c---64875359069.pdfIn PDF document text
    • http://614move.com/clients/4890/File/81648535311.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f76dfafd8c1c5589dec672d5267d7f04/47515194450.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sojibukagunatixo.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/lubidomafinodifesazan.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/semakabupufowovon.pdfIn PDF document text
    • https://mszukam.pl/dat//file/xujimagegavonorixalawof.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b07e4d42c---38524635938.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/dibubolebexomuxute.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/92268918125.pdfIn PDF document text
    • https://avenue102.com/uploads/file/89041341760.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/salakarofojiladuwaperidi.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/wozedusip.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/41349027292.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/wuvowes.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/zukuzojilugozibonaja.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f69e4b37---lugodumedizezazitotut.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/31334003132.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/xewonojitupofedam.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec40ac4b2b2---65849263346.pdfIn PDF document text
    • 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_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 10688 bytes
SHA-256: 6c4db3b080fff0b800c27a96b1858ff41ccc068dc222ce0beec2b8f72a05d458
font_02_sfnt_off00013ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF2 16992 bytes
SHA-256: ec2ef730ec1bb1c4c6552ad8316386c1cb923b59b952be350705b700ceae0c58

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