Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c55f628c925c35…

MALICIOUS

PDF

177.8 KB Created: 2021-08-03 06:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d05da6056460ee11849900de5bea70fa SHA-1: e8a046d2b722a1cc6510ff39fe2f1e5a30df0c91 SHA-256: f3c55f628c925c35b3b749da91436757bc676bcad7971cb29ca751c52b364069
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing attempt. It contains multiple links, many hosted on compromised WordPress sites, and impersonates Microsoft to encourage users to click a link. The primary malicious URL identified is https://inwebjor.ru/uplcv?utm_term=beamng+drive+ps4+cd, which is likely used to deliver a secondary payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=beamng+drive+ps4+cd.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=beamng+drive+ps4+cd PDF link annotation
    • https://photojet.bg/userfiles/file/momasilomupisobap.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a20651bb19a393c13358a65008cb292a/52453739611.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160767b21a6d45---merixeximobexetesozexusa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6uacpidabt0in887jti81ph9b3/85657489373.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/97abe08020cd472acb7a8717de1b5a74/54607560563.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e7349fcfe3c2a7a6c6e4a97a00fa08ac/zemegojubivip.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/98f394e407a81cab62e1d64d8d06bd38/vuludapejutunewukujad.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d986ba8490---dozusiwude.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m97jna8mek6kjemq86j8kjlql2/tedaritezetu.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/11776342345.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ko42s8s1svjnq5dgfs6u0ea3p0/jusixoxakolufelu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c43fb17f108---20969618486.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pojikaxifemixa.pdfIn PDF document text
    • https://loctra.net/userfiles/file/tanupamalofen.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/75577055420.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/85742511786.pdfIn PDF document text
    • https://arerp.kr/data/file///75694042809.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bae809d9268---12497602106.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/sapejumisovofelupo.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/fatujusexuzunozabojegisol.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/21111345371.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/28311136258.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b604097b4---35378543028.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/ralopo.pdfIn PDF document text
    • 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_off0002582c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2582C 18348 bytes
SHA-256: 377fb27bdfdfa471d21f0522d04722feeab46d9c10efd9874bc978b34ad2bac3
font_01_sfnt_off0002889a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2889A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002a0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0B1 10792 bytes
SHA-256: 5a695d6c5316e5688a80fe57d42abcae06760ae98d32c5d6d0e3536029dca795

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