Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dafabec1fd4800…

MALICIOUS

PDF

96.0 KB Created: 2021-07-20 14:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dbcc5eb4d6ba988ba45fae0878533301 SHA-1: 973d89c6ff0b7a5d50583f5f1ccebc30894955ce SHA-256: b1dafabec1fd4800cafd9193b9e56ef3529997b4f915c8441af13f39b95a57d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous links on disposable hosting further supports a malicious intent, likely to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a406445d978---kunorejejilidiralun.pdf In PDF document text
    • https://rajatotogroup3.com/contents//files/71941995278.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/82983923202.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gilelagulogapasiki.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/a51mn3hd4888vbr64fm7i5hc3h/89729338744.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f3f9186416d3b7212357a9a1bd42a98d/zudipalufajazekaberekuwi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f7fhk08261rfq230jkfseciur2/riwobifi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0eo3ugc51d5vl37lhi3ble09pb/sodijalubosaxusero.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7703adc5fa2cac3ec7ba5c5c561c2172/reban.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/fupunizap.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/41581991294.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wogogijulaboje.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/niguvobefi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a248d4ae1---28832044415.pdfIn PDF document text
    • http://weingut-suppan.at/files/32104908447.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/jimovejeret.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7nq6qskl5hjnm1mts4k9faktgo/dufakumujidefinotoraligat.pdfIn PDF document text
    • http://abnicum.com/files/file/36246233846.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/253156357ee79188c9957f967e22dc44/vopuwo.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/29010432705.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/6439617936.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1gs500hvms9kagqqsg2lbpffvj/mozuvuwodine.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/jisuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=movie+quiz+questions+answersPDF 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_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 10508 bytes
SHA-256: 430b1a812b50af9dceea043c8cf95d533959418b8d4ec88c6ef37423508473d3
font_02_sfnt_off0001437b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437B 17508 bytes
SHA-256: cae2867cb825534473b4f96a7a5c3cc3a5b0ab5680422d6ed58cd530dbec94c9

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