Malicious PDF — malware analysis report

Static analysis result for SHA-256 6356e686a34275f7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 05:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0602c246a74687f834c678a5e8f45a9e SHA-1: fe3398b25c5e6a0fdf8a86e4725df4994e66e4ec SHA-256: 6356e686a34275f72b73939c5beb727931c429acf13964faf5e29ec36ecfb647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pixomot.ru/uplcv?utm_term=social+media+usage+statistics+in+sri+lanka+2018+pdf PDF link annotation
    • https://vatlieutaphu.com/upload/files/dalusijederufanot.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130a194d183e---82964133650.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/xixedipiwotafafaxodikamaz.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/wepanebexofafavifubonuvu.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/lezanunajonodoga.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/51438221346.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/36790194069.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5795a796b053c9738aa1b701537ea432/mularotirumulerekabukepe.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/hihhs1gsuaev475t70s3sh0di6/jozuk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc12209148---98408252237.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee28e08add---robasirofor.pdfIn PDF document text
    • http://4rrecycle.com/files/file/pisikaxi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1de7ffd09e12c1c4929b918cdbba1d82/89032721380.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/37275684003.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/34258457012.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gakoxa.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/paxapujebidimeti.pdfIn PDF document text
    • https://drsaman.com/files/68270289539.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/86265747657.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86b42dc74---6573547604.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/49308084544.pdfIn PDF document text
    • http://uhorder.com/upload/files/pevapegiwolades.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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 11732 bytes
SHA-256: 9a80b5ec74514d7e78496db8a15123c2cb51b286f684d81d5772ef3d789baf5c
font_02_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 17896 bytes
SHA-256: 5cbec81d15eb483ac872c8cb113dc6719bd7b7a8029d14cac45c0f019e4ca3af

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