Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fe4a3fd84e2b99…

MALICIOUS

PDF

95.2 KB Created: 2021-08-23 09:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 94a50547991c348aba604614c7d79d5f SHA-1: 3b164b3606c25f80a1405f928456e5a36fa6fdb0 SHA-256: 44fe4a3fd84e2b999fe3206464885224c14a5cce8be2a4dfab4b5a09615f902a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/24037764424.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753189845f9---99106295609.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609946f8aa88b---xidepikopamamib.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9309916a8---ropoma.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/f0dbhec72fuaeoac6a9r9ajbg4/75660637829.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b7aecf10d541cfb8d38e859235b8316a/46489067681.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f3062300ae4d783016b23894893d3aeb/nevivosaperude.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/galaremotaworujomo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f7a0062d---fokapowowem.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/53581032492.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xozinufojuga.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2bd7695b3e4f23274c15767923f92834/sotil.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161157469de147---57517037128.pdfIn PDF document text
    • http://askort.pl/Upload/file/purojogukowitijo.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/90765822264.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/fuzosajisuf.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/bapegidotibukezaguku.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/xovaniwapezovazisalukaz.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbdd97bbeb---wosarukupetidifigiwo.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/59132419151.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742224577b6---72377268507.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2751sue2b1nm5lsu6jojfj4sa4/nodazamapipaturesetomobi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/11087357113.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/86b3244b19ff2634be937fd3ef5cd74b/16808895746.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160922c55713a4---zonalitopamoduxepipanoga.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/jumivigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=love+yourself+believe+in+yourselfPDF 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_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 10324 bytes
SHA-256: bd70fa55500eeb6c859674979a856f901d0f28bc3ae67e88138b519e91906f3c
font_01_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 17376 bytes
SHA-256: 21a76fd87dc838af7740ca0472556375efda94ada0f925422c8f37ff28f4ae6a
font_02_sfnt_off0001550a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.