Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa61263b7833846…

MALICIOUS

PDF

92.8 KB Created: 2021-08-20 00:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 2fe469ef67774329ad24a9adbe4b7955 SHA-1: 4eab376c3d673106bce1e549739c48320897f0fa SHA-256: 2fa61263b78338469821d78a10d5912abf707dfc993ba275ff12419131118d36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=que+dieu+te+garde+en+arabe+alg%C3%A9rien PDF link annotation
    • https://bishopsalamatkhokhar.org/userfiles/file/71562175485.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/d1rgovj7lc48mfa38nes3jtefb/15041290027.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210716000253120.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3467360a6c30d7f029b12a296b5c67e4/vanedifos.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/megovujuf.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf22b06fc---84431893145.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3630b39dec---51047063645.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/16039610025.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/28a0726auj394qp25fv414ck3g/davabidu.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/33633006904.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/17137072346.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/21814672736.pdfIn PDF document text
    • http://kd-council.com/upfile/files/risevubifodisawutojuki.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091e174198d4---76914223539.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a57646098---latinidixefawugajorub.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a8d8c365---voraje.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/letukoxivufiwelumikudari.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/76949108600.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/funub.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/gexejefu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c218c3749ba---55367651764.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/56448333858.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06b9681eb---47281849210.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160833382a58e1---lototigifeno.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
stream_004_off0000f7c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF7C4 20036 bytes
SHA-256: c0e661cd907fee495ed8ebebf97f277b47a4c889125b5f4d99d01d7232276c1e
font_00_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 10588 bytes
SHA-256: 6519c47b67b8b0b173dc4f2624a9b9e39af1677f99873b730e007b60feaeaff7
font_03_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 19584 bytes
SHA-256: d7da37755f061db2e0f47ad48e16c977dcc78a9548b9559ac2ff6f9c3027bb50