Malicious PDF — malware analysis report

Static analysis result for SHA-256 b065f5d1053dbb77…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 23:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3efd33d051f338da896054b5b1b78e0c SHA-1: 7061556ad3365e46fa416e50b1aa771363f351fa SHA-256: b065f5d1053dbb77a91fa2ffa70f59339f28eb32b0d4fedf1ca7a5891dc467ac
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=the+justice+league+snyder+cut+online
    • http://innersolutions-uk.com/file/80453749366.pdf
    • http://budaors.varosom.hu/userfiles/files/17248393043.pdf
    • http://www.frank-diagn.hu/userfiles/files/lipobodududoxetuge.pdf
    • http://wintec-samu.hu/uploads/files/juvolupadosozedevide.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e479c3a380---88561701004.pdf
    • http://playonathletics.com/userfiles/file/74336647702.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/515b41ad7f0ec3618fb967ae99f6f1d0/7122504178.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/12361804816.pdf
    • https://bamfieldrental.com/userfiles/file/17516403560.pdf
    • http://exmar.it/foto_fck/file/sifozugetotudon.pdf
    • https://its-bulgaria.bg/files/file/fajase.pdf
    • https://stauber.lt/images/files/20771910207.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/33959671643.pdf
    • http://metzlerranch.com/userimages/69118811053.pdf
    • https://lotteppta.net/beta/assets/file/namesi.pdf
    • http://kasintorn.com/images/upload/files/fafatubimekisotulibeko.pdf
    • http://teusz.pl/UserFiles/file/wafikugagexekosaje.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a9b4999af85b9a97224ee4f90d534cda/bapirulipenafaxog.pdf
    • http://321eastern-thailand.com/userfiles/files/2368428965.pdf
    • https://alohasafaris.com/files/wodoxizesigikunibojoju.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16134c13045399---21717839420.pdf
    • https://osakaav.com/userfiles/files/62409107470.pdf
    • http://pmke.cz/pictures/files/4513995631.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613960a69848f---razepov.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ace807ab1---mexuxa.pdf
    • 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_off0000d08c.bin
632b45f79fcfaa025ebf08990fbe6c9283657b2b5848540c771de85284146c8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 18364 bytes
font_01_sfnt_off00010042.bin
130f74a550ddacd7d2dc2df1f150ce4046f15a57b8effdadb4dcf048003c01ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10956 bytes
font_02_sfnt_off00011973.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16792 bytes