Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94b869dfc8bfedc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2d3e35980020e422b27f5da5d736f926 SHA-1: 637ab6c6f19914561b1fd4b2739767db2615758a SHA-256: a94b869dfc8bfedcc92691d331d626d828da980d398ecb4e04cef159e0a9e317
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://parkingparts.com/Upfiles/file/75793457000.pdf In PDF document text
    • https://vibanghanoi.com/uploads/files/baresipaganabetarikagen.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6acqdb6lb4uqu810i7phgnen7q/sovajisinovifede.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f16e43b870c9d64ee866aecdd39b1b85/xopipe.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2433b8ff7cd67dceedc66e15e9ae735e/gimuvitamedipafibupuvurew.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad888dcd02---65278406662.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/3927794535.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb636816d---85401224089.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/29140072297.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31037641348.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32177427695.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xumokizexexugeraworixafaz.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vubufizipupozuligir.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec1d87834---tapobuvopolo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe7bcb4e---2095184666.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/watenumagututax.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/fda70507f409e13cc527a0e7f9ba24f2/vojovuzuzonesunawawodi.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/togupobu.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/rofigemopopoluponube.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/48010485272.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/153ae943a2cf102941a58cc2e8c5b7d0/dujepebotejikiz.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/60753038571.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4683716833---42449021534.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/fojixoruv.pdfIn PDF document text
    • https://lecachet.fr/docs/files/15827164143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=new+business+models+for+creating+shared+value+pdfPDF 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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11436 bytes
SHA-256: 935af4b5c61703eee924cab976b9f4dfcdea2dd0ab949b67ec6e75df17638ccc
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 18788 bytes
SHA-256: ebda167443a0a9dc57e0e156e7778512c76348cf560379dbe835552aab65f7e1

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