Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b00fe38fb91567d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 17:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae05ab50c0f3afee4ab48ac82cebe088 SHA-1: 21ed862ab9ce28fbc103d147bec45c75556ff0f1 SHA-256: 4b00fe38fb91567dcbae76000621bfc8dd208f1d0ed7e2998a0955002a442cf3
236 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a social engineering attack, specifically a payment redirection lure, aiming to trick users into changing payment details. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports this malicious intent. While no scripts were extracted, the document's structure and heuristic firings strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://niszczeniewaw.pl/userfiles/file/99217615935.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec504b46bb2---47679547618.pdfIn PDF document text
    • http://normel.org/files/upload/file/volutozepadonulufit.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5598537f993af1d1a76d61b0ea364c7e/sogukusofowomowas.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c65516461---50606363025.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8ceedc75c9677dd0ca86d1d4d0af118b/13554472807.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bafnkqfvbnlvch0shqbf0iprt7/gokolinunuke.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/senotixowaxizovukiman.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae726806bc2---980779109.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9p9d3vcsafqkfmmmkkjrqvjchj/21875242641.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/birevajivivasix.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/664706104.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1031ca45205b6670a3f1ce76efd44aa1/durowanutisazamenidomeva.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/fipiwaxekexifiwikoxuga.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607660f12d15e---3982885663.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/kifubevi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/77212062900.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/lqq60u8dnmupgdpvika8nlvcka/fosufidesaj.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/67162379600.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/09c8799178d5f8a5f5b7c8f7dbd78a8b/xunibozogejawozobimajar.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/kagazupogozaweputo.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/19407374159.pdfIn PDF document text
    • https://bem-sa.com/img/file/jadabitirexatimorarananes.pdfIn PDF document text
    • http://airmon.hu/images/files/98981467011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ldoe+unable+to+connect+to+serverPDF 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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 10536 bytes
SHA-256: 7e45d9fb64f58dc69be2df34b02fb4182bfc856e6fee9c4b7cf04dd0d12e9c72
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 17308 bytes
SHA-256: b24bb665caf154cf4409ac8565a1807940664a123af6ccddddf5fca9cd9fd175

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