Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ce6731297a4ee5…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 09:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7914d74e83258574821dca9b34565a2 SHA-1: d7c7086ec1117a4b59b6c9c2513657e78f6958d8 SHA-256: e9ce6731297a4ee5ec411a2a5362b7eb8f529221d030cefde159fdd92c81ed97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The PDF also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to distribute malware or conduct phishing by luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=gta+sa+doraemon+apk PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vsch1rq2etqm9ag0cps28644db/gujesozaximoruma.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/97b546f18c23effa852f896e1be281e5/xobejizokotebawopero.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/38705425017.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/puvisebelonakulivija.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xiwesizupekajaxipito.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/fofokaseliwivulozixafizug.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zitarebupepuve.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l935r2d7o37vuj8kg186a738e7/notavutojokifulobowu.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/zidumutinarefibeto.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/kemiwalijavezizu.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nimolufawujakutox.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kepitenimomubadevo.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/10064979657.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/74977683248.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/zebimavibematal.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/34320379743.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/97508637478.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rexenigugipilijito.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd689f92c---xururizoresivebifexobuzok.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/74921979593.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/98659562659.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/kolepibojetet.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/84786621136.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eafdcbbae---13779736269.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/92061048089.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/35809348928.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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 10548 bytes
SHA-256: d9020f5cdd822653434dfd1cec1a2a261b9b6e8a95f5a3d857081e96b2d8c660
font_02_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 16396 bytes
SHA-256: 1b3c2b32e1ff7187b718d3f0b68c75373d64e387b892057bba49d49786bcf353

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