Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51b97fe629cd227…

MALICIOUS

PDF

86.1 KB Created: 2021-08-14 11:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc36817c6db9fa6ffc96d8311c9ee7e5 SHA-1: c1f0bc6cb282346e60c592ec883dd6ca920cfe22 SHA-256: c51b97fe629cd2275a4e3f1f95d62b132bda96f2c38f48469c114fa799915742
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic confirms it impersonates Microsoft to lure users into clicking a link that does not match the brand, strongly suggesting a credential phishing attempt. While no scripts were extracted, the presence of numerous URLs, many hosted on compromised CMS upload directories, points to a phishing campaign designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+latest+version+pc+name.
  • 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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdf In PDF document text
    • http://brilsports.ro/userfiles/file///wegudilezajanedanu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ceee9652e56d3905025e5900c478b8a5/leverizidedikolirufet.pdfIn PDF document text
    • https://chptravel.ir/data/file/42596901126.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/42410060480.pdfIn PDF document text
    • http://rld-carbon.ru/file/sekutobu.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/wagenaberez.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99a6b59f5715604ec88f1391b9efc5bf/62931662840.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/fetogixupogazadavego.pdfIn PDF document text
    • https://area5srl.it/file/51320131577.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/dilefesakaku.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xepobonogenasakabufuvivi.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/jexevesatakufinuruke.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0dae26ae21d99c5bc3674c8cbca6fc58/49288611372.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b41a74538---xisilasovazidabeba.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/18655069126.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/88327802774.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45a10cc33---linanidep.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/rilukulamugepidewegi.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/titudogaxiduwijagase.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/59189513182.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/19467670157.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee9b0034ae---26871398089.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a25d343b---neripominulojizagumufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+latest+version+pc+namePDF 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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10864 bytes
SHA-256: 34723b7c0a254e459f14263dff4d424856fd072047e48f579091151ff2a2ddc3
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 17572 bytes
SHA-256: 79f2dc9140b137ee30b12bdf0ce4c0cc1e2225907048a91f8495d5fb805d6069

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