Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cef3466628fb415…

MALICIOUS

PDF

90.4 KB Created: 2021-07-14 04:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5231ec175d4db77d8f3f412ec311972e SHA-1: aee55b1a48cff1e83146914aa1c0fb4b2a64e67b SHA-256: 4cef3466628fb4151c40ffe15a3f7de8d680ef0a3cd9520cad948c8058d9f222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files or phish for information. The presence of external URIs and link farm characteristics indicates a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=tekken+5+iso+file+download+for+android PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3deaa74bf---2655018726.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/85415913819.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2444992ad---lolutadetezexoragi.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/ronomizewowetozisavusulaz.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62a0e0275c---wixetugo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/05e905837e6415f5f8b48ed783cc0b9f/62073344557.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b18ce5f4d---sozusuvapimutuk.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084732eba468---70271893638.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be2aef2bcab---30166385570.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105170429.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/46380124374.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707690f1d3d---dagixutozozove.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/jinukigezasegojexigivax.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d3075cd8b---26918988270.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/gudopotixesurifazi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3860df064ed419cc890203a88ec76243/83952087111.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/33226025914.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096df5906df2---38499272874.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/95073681913.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t5unaqprbug2dl0d2eo4puar71/zigububiziwazomo.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/78425989601.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/72e617c0d3acf56d5990b1d1d6ebadb0/fuzagetekebixodajizip.pdfIn PDF document text
    • http://tyextractor.com/d/files/bexebaxefolojimelavar.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/vutujumif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 18104 bytes
SHA-256: 7278c54eeec4f28e60946387d4b41aaa335819dacfdb646114bbfa41ecdfad68
font_01_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 2144 bytes
SHA-256: 15cf0eedff41921d6fa0017e7f7317768b104473f6d22aa261b335db870fe842
font_02_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14372 10524 bytes
SHA-256: 27558a0edb2d34166c09d24c5874f6bd3ab4649276b18d0f1a837501610cfd83