Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33733ba3cfbafbe…

MALICIOUS

PDF

76.9 KB Created: 2021-07-19 01:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e6fd3072065d16a7e768b3819870da8 SHA-1: 95e40a372bd97a5e115c26c27d6373b379820546 SHA-256: b33733ba3cfbafbed7aeddc19c45c58b3141466b522d94727b1159da9d92fe38
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm on potentially disposable hosting further supports this, aiming to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e32e7db57---galuletexuvo.pdf In PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/cd6b3c148ec93522a43a000b332bb74e/vekuketorijari.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/podikomoganobunuwu.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/20993819620.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/rinenonetimevi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0e81ae419e24c3f5ad415b6076ba158a/35075978902.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/vanigelula.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b215e515a09---sesosizopovikepadapulerem.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/46864004345.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/zesanetorafumazigu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a449b711e---wizufuzitinen.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2dfa0eb8---loweragaporaderodakiru.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gugakukivutid.pdfIn PDF document text
    • https://alutat.com/data/file/basenowimogerajixe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/diledopubum.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/mefekulenidazuj.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/i8u45s9p1tapo7etvo5o4hj5c1/komaxozobenebufix.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750bc34b4e1---67977668388.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a8eef019---vadedum.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf472840c---nubenakuwiximebepukub.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5a9b2e66---pomejisukavux.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c87333cffc732158d4cec92eff51ba1/70272993486.pdfIn PDF document text
    • https://ubranni.com/uploader/files/50590582021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=signal+and+system+problems+with+solutionsPDF 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_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 16988 bytes
SHA-256: 9c65aa8cee4e953e7aee8b64676f586229a5442c7295cff76910ed3d1e3e954f
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 11352 bytes
SHA-256: 7b62ce31da04985f19e0c20f567b03ea74b7d73f3e39088c26df8bc02140641e

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