Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5287e64a68f802d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 08:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cfb5fa9ed09a6852d8b8872cc202cb6 SHA-1: 0c2021fcbe24da94bac3dc1ad88d504176b96968 SHA-256: f5287e64a68f802dc63f1ed8749615b1318e78c82308194e189d85af10685738
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites acting as link farms. ClamAV detected this as a phishing trojan. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c38009db7f5---59021239463.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/96394294d77e6791974f140cdaf110ca/71121633745.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/pitetikedixakaje.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c964021ca1---zazixuba.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/59413670480.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/butiwuxatixuredevolot.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zejovozibaloburidenukorow.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/migot.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/loxedala.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/97977862620.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2765f18d---razebadalimasunigamakodi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ccde64f7---1466825381.pdfIn PDF document text
    • http://fitviewer.biz/files/file/xizonazesegubamati.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/39628950983.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/ladaboranof.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/gatepuzuzazemigumodadiroz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ba1a3304d206d18e08630d9086ad2ae0/65151955179.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/68998073442.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/31913030836.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/57689652741.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/11515103116.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0869aa01c---bakuwujuvabixebe.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/82753731872.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kisotedidijovevaserek.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73a86bfca---xakimevexopibizavunifudud.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16092a98011062---87368646049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wow+3.3+5+holy+priest+talentsPDF link annotation
    • 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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10912 bytes
SHA-256: e642604e87c3fee61faf9a5d3cf4cbad1719c28446046880dfa3b2480d4668c5
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 17360 bytes
SHA-256: a2da0529b520fcf4c71444ec977c741280e419b85e66f7ab2ce405eae204e494

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