Malicious PDF — malware analysis report

Static analysis result for SHA-256 45946b25d7c55321…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8e46ad56fda05740684752c327bf456 SHA-1: 93b99b43c60b16bdd03e1930130553d7b42e4e9a SHA-256: 45946b25d7c553217c85798d1ab355a7f75ae78f9ae796beed0ba85139989f87
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=dark+anime+wallpaper+for+android PDF link annotation
    • http://malovanesklomh.cz/images/file/jologikesuzafepesubuvuli.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/81184092273.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/vosebanat.pdfIn PDF document text
    • http://smirna.pl/files/file/pulopekel.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4d3a988b---bufunamipor.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/35994134535.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/1268946662.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/1737180316.pdfIn PDF document text
    • http://tion.hu/upload/file/57006958862.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/wotuzani.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/wusapotorojos.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/domulenuxolikowozu.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/vevezu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140735950c01---pasawozubo.pdfIn PDF document text
    • https://loyd.rs/images/file/kozeroninik.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/81382688440.pdfIn PDF document text
    • http://taigesw.com/upload/files/19867958512.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/tetezigixonesujakun.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e3a2395---jujukomisegiwolemigim.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210909045918.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/67423895415.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///87436030142.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eded825f18---98393613394.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/46624493438.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 10572 bytes
SHA-256: 1f1b623a9f42a22ee6d993d85f6c165f0d1ce6c1eac3b19862cf9b21f231aa15
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16064 bytes
SHA-256: 32f4b879a87b4e5f6e57048c1ea994f58dc8b7e0b15ae48399fe498e63d208b6
font_02_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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