Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b612bfb6981aa70…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f575630eebbddfb421ea79bba6dc7cc9 SHA-1: 63938e73f98a345d8f07035b002cfb6d380ea49b SHA-256: 9b612bfb6981aa70363ae99128796bd33fcfca01627d4fc518aaa0df4e6bfbd0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eco-translation.ca/upload/editor/file/metazugoli.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc5791a280---ziwuzewodovawu.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/20948831524.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/70895243683.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/99650436235.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/89294421089.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jusapenebubipefusazaweba.pdfIn PDF document text
    • http://gapp.fr/medias/files/ridebazesid.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/pagonolu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a3752c44cc85158d9f4198703afc4569/dokavixegujuliru.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/sekusedukijumelapamadel.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/robipivi.pdfIn PDF document text
    • http://centromp.it/userfiles/files/23335704967.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380d810b4ad---xoketitebijol.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150537d9d571---61556315016.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/tarazudosuvoti.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/20048958069.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h4mo6d87sht5603qgb8ve46iu4/bexodoxovozutexo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615341588a013---wuninufevumexinizi.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/pirogajon.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/fipefumuzetijakerit.pdfIn PDF document text
    • https://ms02bet.com/contents/files/89898484492.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/39282158245.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614785e656358---52210528511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=volley+image+requestPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 10676 bytes
SHA-256: a4dc794e1467500154b861c1cf4c33446f6ce904396a325e847b5a9d13cf9f75
font_02_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 15784 bytes
SHA-256: 93440a5d1d98fdc2240cb313cda18ce48ecacda79760ecb6b2b01975d810e8d1

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