Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd485c6557c30b6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-05 01:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6861d089783f66ef80819a8f81508d5 SHA-1: 3f1fda88926f5bef2567913c87b0e50051e30540 SHA-256: fbd485c6557c30b69b4727675daae53abd4e92f0bb3df02159512e68b6757772
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://clap-bas.com/userfiles/file/goxaboju.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429234823290519.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8897c2870---parexakawovetevo.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/85058717363.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1860cd210e3365e008e61550e506ef5c/rawumozale.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/96771339882.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/6863176928.pdfIn PDF document text
    • http://klinok-saintp.ru/files/4710885087.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/kiwuvimadokurapupabum.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/10330758342.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///wezufawadizugaloxed.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/fevalelebuxibafapife.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756eadd03f1---tojibewipidesuzaxe.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/c8f63595c4aed1886985bfedffcfd124/sosapowirugegunosuropapop.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/wuwazokokekogafexejado.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/meminuwoxebewilorulojedaz.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/41755876990.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wedekilurixugimijepa.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/130366793460d5236761f2b.pdfIn PDF document text
    • https://10fci.org/userfiles/file/sepaxizakof.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/13010030084.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d7c0769947cc3c70be59cbc8671222dc/demorav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=definition+of+handbook+manualPDF 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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 10684 bytes
SHA-256: 2409488275e5c4cd2e1d5afff1abbd0bd67a8311818cc2e171ee68bc6da10301
font_02_sfnt_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 14412 bytes
SHA-256: f9400baf5379640efa69dd5161bb742572ee3c361e618df02d3642bf65051930

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