Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8178c91594dc81a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 02:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe4de53409795adcf3af7063e3816afc SHA-1: 519232c31b0399121ad38fbec74690b4da8f3bd2 SHA-256: f8178c91594dc81a2942c2d528538d73340250c41162b1d2dc461534a8270a03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/568531a20f8ff88e66fd9f10917af424/sonikoj.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8489e17a8---kogupebekofokotafixad.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/83431330733.pdf
    • http://ipmarketing.net/userfiles/file/28240223454.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/s6euo7qn0brr688c4hi8ensj83/kadabasajusaguvefagit.pdf
    • http://df-2.de/images/daten/file/wesotalijukoxojamubabob.pdf
    • https://eobliecky.sk/userfiles/file/tiderunarana.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/60cab27835c1bd04ba639caa195fe085/runutalenepugimob.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93d692711c---bisufupubib.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ef6d3b72fbfd49a03d1b13922e789f53/13721880305.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/io2cpvpkrdg5gtg2a4384bp5ad/pirokazutonodokufixewa.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a65242b7b8a620c67343086b12cb3bb9/30536033499.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c736b312480---kenos.pdf
    • https://wickedcheesy.com/images/file/wikiv.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01485f3ad---nenefagewozetewagavojole.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/77bf965437c1b696dcae191ea34740c1/90380824463.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceee58c72cc---24549485031.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/deratosifobeduwomipinipo.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3p6c1f2onsrdr05mk9gh4vhf58/94583571052.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a135c42cc1f---kumelaziwede.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8941b7268e06b70ac69768d3185af40/sikolor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=side+of+head+is+sore+to+touch
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/818c50537c8a809a8f71951f9678683a/xizitule.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_off0000e7af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16792 bytes
font_01_sfnt_off0000ffc6.bin
32dd37224f3ecf7c839495922a49f597f7657f8f9ac79923f9a5cfe0493a3e46
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10596 bytes
font_02_sfnt_off0001181e.bin
45a101236a61e9d475911e2f7952cf312974a75f1de80a7fb9b9e38cd32ba5ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16912 bytes