Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0822a567990ab4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 01:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b05c9816eb0be0c5f1fed3c19e7d8a8 SHA-1: a6e1750497443f52054e7fb7146844aa905aa602 SHA-256: da0822a567990ab411d0dd8c268ccc0601e8b2748aa57b079dfeeefd0e35b599
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials by impersonating an MFA or one-time code verification process. The numerous embedded URLs, many pointing to link farms on potentially disposable hosting, further support a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://philabc.ru/uplcv?utm_term=how+to+get+contacts+from+apple+id+to+android PDF link annotation
    • https://korovin.org/site/img_ufiles/bumugejunabomefe.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/vodenikemefuriwivopijexu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/29413489290.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fivanoteminumikegujeso.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/gafuzesotabukuve.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/ridexatuvofoxizizafane.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/60003632755.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jt648s7jk14boib15utvmb2fd7/73397915435.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/94220627135.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rubos.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/86029440248.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390916d9cf7---wavugu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/98916829526.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lidumefuzanowurudi.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/32245358430.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090319483673499.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/64836833521.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/pevijozelife.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wajozedufafog.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/5005651603.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vefiwomabiwuvidakasek.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/20352979496.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/76221721070.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/19483313171.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/io95dblkkke1h08ul0qcblnofv/2940833134.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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 11040 bytes
SHA-256: c2d1cbd6ec304bfe7fdda96fb319791f102dec97e9b1e62a69bef676008eb1c0
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 17360 bytes
SHA-256: e58565daa619d4af6697c35d44832b139ad224c890b6a14d02ecebd3c33ff5dd

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