Malicious PDF — malware analysis report

Static analysis result for SHA-256 8530aeffd6aced9b…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6256522fdc01ffad5eb9f43280e2d666 SHA-1: 0f299ba47ed81de7a1deec94f943e6fb41406e34 SHA-256: 8530aeffd6aced9b0c6ff4631a4b8d490c4398c79159a0ba4094adfa5d3ecbd7
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits multiple indicators of malicious intent, including a fake CAPTCHA lure designed to trick users into interacting with the document. It also contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or credential harvesting attempt. The presence of ClamAV detection and ML classifier flagging further supports its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/c4el2hjbbdiu35ebs8ek7e16lq/14639869112.pdf In PDF document text
    • http://generaltubi.com/container/ckfiles/files/79760319956.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/718f7857095824e1d3ec708b0a4a1696/93301967798.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/84196059188.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6379918cd9---bodadosuvid.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/loxewejenajuro.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/duzezuvimawafuxefad.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f831e707---sekuxejizazari.pdfIn PDF document text
    • http://podushka.by/files/files/funalutuzesalazasezob.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e1f51ddabe668647bdabb230db0add35/31881208897.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c75414c833b3152a830603fd8a818873/98156269449.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/iou6m6psehlqfhnpmv4rsip4j4/14926915354.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db66dc7dea---50172842501.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/bokozetegekazotameruw.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094040286421---midifuxa.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772325232e5---30910478559.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/094779539a3862e6c077bd699af7cef4/6870028883.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/sedoxigoradureripi.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/67564486316.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/zuval.pdfPDF link annotation
    • http://doo-san.com/userfiles/file/20210601105941.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/21361309881.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/976c800abc1b31ffbf185d4f13121196/vizuvixeginafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=frp+bypass+apk+2020+latest+version+free+download+100+workingPDF 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_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11444 bytes
SHA-256: 34a35ce597c1c4bdb25d2fdd2b652221c8b405c1c1c37ef23078e4a3aa0a74ad
font_01_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 17328 bytes
SHA-256: 646a0f92e8ae0fee95099c03225d50b0069ae44cb69330b5fee19fbd423888e3

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