Malicious PDF — malware analysis report

Static analysis result for SHA-256 4197b33f7f1423b7…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 04:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9d087f3083feaf131a2d9164d04102d6 SHA-1: 35c93aa253a996f28ac4975c4679bbc5215c94b1 SHA-256: 4197b33f7f1423b7676e03d146a82c61855175911028649d97da5c14a1ba14e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised or disposable hosting, forming a link farm designed to redirect users. The PDF structure and embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://inwebjor.ru/uplcv?utm_term=wearever+pressure+cooker+manual PDF link annotation
    • https://powermailer.in/userfiles/file/97688837198.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/12090417306.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5ba3df71---vosafeligefugewamita.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/xaduku.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/letuwudararusut.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/ranutase.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9078d13fb8a40052d5e6049447866d9d/vuzul.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/majilalusilukize.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108040428135565.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c3c02492---diduresukonuvu.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/51301732373.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/wamebat.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/898b96c22cf39129f848682cdc41a0e5/fipofa.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kujime.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f0dcd970d---xowisato.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vddhutvo32t10bisk4672ddp0g/nigifanezimodekujamozo.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fagofewoziv.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/lujozusedas.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/59255416426.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/tewojuxemagivuwiduro.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e806cec046---44788931506.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2938d8a0---65756950885.pdfIn PDF document text
    • https://soechi.com/userfiles/file/8775881549.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/ritavug.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7b486bbf367eb942af2e14814242c44c/13696029328.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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 17284 bytes
SHA-256: 3c53c0c6cce16e84c7f5477669c34d076e349a02a3c5748a7bfcc528192fede3
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 10596 bytes
SHA-256: b71ff0c8bdb3a2ba427b88fe5abd7229b8c19767a67d9b5a2eeb987536c219ee

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