Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1ef46b82a9fd24…

MALICIOUS

PDF

79.2 KB Created: 2021-07-15 15:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 81f372c1acfdc0571eca8a97c1cd7675 SHA-1: 4f4e0b224a7aa68305c9e1e74721e503068b41f6 SHA-256: 1e1ef46b82a9fd2431dc12306d06fd464b778e52d18b2e3554cfd461ed8fc332
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ash-graphy.com/userfiles/file/21006982811.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g0oms3e0re6l2ta28jj7bmg536/92292009085.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160858646f41ad---voribef.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/regugaxolu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e0acbfaf---23122923868.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075caedcbc8a---zanubexevewuwewujoxisifu.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/37a00f65200660bbb7a9430b75ba9dba/47286256051.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/pawetadodijaw.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad298c96b---gumagexiv.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/43713164041.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/sufurinetigefolale.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210602193643169.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/2504802071.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/88542a9b66217227d9f15fd7eff074ab/60398515033.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a01485c62cfaf39e7ac24eac8267f529/74501154253.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9c8408d7b---livonijasijafilanobugen.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/bafemikekolerozofupobapok.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/legaje.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0b1a7827d87562e405a18f55ead9b951/73521853859.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/80683738945.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/81753220252.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd8e05ff1---vuxusufepivuba.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/gemekofiposalopuwil.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bbf0f61b---32761438398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manualidades+rossy+quitoPDF 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 17356 bytes
SHA-256: 1120bf5660a3457ba0edb1a25ae56722ca07aac71e25f7e12203124606eefdca
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 10596 bytes
SHA-256: 5b4e6ddaee60c3b6e83a272e516fb02f3aad89e04606d7968546803d513d1e0c