Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fee1b03c752f66…

MALICIOUS

PDF

84.8 KB Created: 2021-08-06 20:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e6e98619cdbda189f2c028633558ac9c SHA-1: d71931504ede7ae9fd385734080118409fb194ec SHA-256: b3fee1b03c752f664ff5545bcfe299889a4ebfda328aaf479ab2400258bc01d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/1938284041.pdf In PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/gilegalogupewus.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/pobiname.pdfIn PDF document text
    • http://praguetransfer.com/files/file/81477851607.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/73546689180.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/9904332448.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/18972770784.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f7369e16---sibukonimobab.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nowesivewomo.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527102614.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixugazusifuvomilubexe.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/79770377542.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb96dd54d---85185144127.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/jofowabujedix.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607632d45ed9b---genesoxorogave.pdfIn PDF document text
    • http://texmet.pl/userimages/file/totukidavexibijagejez.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/disilozixutiwujixifanifu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1300f21806b4f651cb4abf83093b8353/72269213590.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/sirasolawokuvewugebagip.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/suvabevaxapetitemedelod.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f2d8f76---sejaneku.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a3405f0578a82be4c2b7ab65c17166b0/81603669136.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7fb7853f7---vonatiz.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5f950380---negitaputujaleranobiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gemsona+maker+no+flashPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 17764 bytes
SHA-256: ebb261d99a45a96031321f015bb630c4768f3b1ce1bd1a95ee7a5b0d937bdfae
font_02_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 10420 bytes
SHA-256: c9faf7c00658cdeb7e52e344a52789b69aff32030c01423f2a89b77940385728
font_03_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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