Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f696ff28fa71e8f…

MALICIOUS

PDF

90.5 KB Created: 2021-08-11 04:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49b471de0356425259df5e72d34c2f3b SHA-1: b64291c03810998c4a8d7c8ce65c7bcf0cfd594c SHA-256: 7f696ff28fa71e8f590880f2cdb915c3f2dcb188b789e382f16496b652b07c40
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on compromised infrastructure suggests the document is designed to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e37f2bcf5a338db5411d53fdecc4aea9/fijukunuboranirabo.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/95edc5593d599a869e4c300ad24cfbc0/podux.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/93422987926.pdf
    • https://mfdesign.hu/files/file/pokawinotumipejid.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/850e6fd84bdce8cd9e547b07f8e52b7c/wugorolulanutuj.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/931a5e6b3aaabc7c209141e656e9b618/tijos.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/90540768b3fd4f43ab6540d1f59bf05b/wusajupi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40bbc5b05---98159156239.pdf
    • http://partnerplus30.ru/images/fornews/files/gukosalafa.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/gosuv.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/c473oe907p9ss8h3su5197c0a5/kegitagodotaxazexeg.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e043e266e4---25189796183.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/62424541368.pdf
    • https://itchanoi.vn/uploads/news_file/jujokotofegur.pdf
    • http://www.pranabkumar.com/fckimages/file/61756354235.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/kubigipixemipavinepan.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/tolevimemopibok.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/473eca5bbc05eef670358f0a3b458dd7/78835544579.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f035b5f6cc---pojelisaxurozoku.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/0qt08t39k357u9lf40jv680ni7/8889559365.pdf
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/kaxexejemasosedozekesela.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/73209029711.pdf
    • https://deltarents.com/upload/ckfinder/files/55555313291.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=multiplication+chart+up+to+30+x+30
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010157.bin
dd07d2e1efb62343a39d48db4e4d699083be580bc23f69030ec46c19263c3d8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 10660 bytes
font_01_sfnt_off000119b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 16792 bytes
font_02_sfnt_off000131ca.bin
03ce77ac210228473803929084a72c3262d9c35a76767f5c92a9c74839447c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16392 bytes