Malicious PDF — malware analysis report

Static analysis result for SHA-256 421c5f21cd62fdd1…

MALICIOUS

PDF

66.5 KB Created: 2021-06-28 19:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abb07309027d3b23aa76e38148f8d898 SHA-1: 8c618fce933379439607fbd7e347e79533706df1 SHA-256: 421c5f21cd62fdd168a67d99a32a338b310f14f2cfb189cf2237e24629005f1c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=5.7+properties+of+logarithms+worksheet+answers PDF link annotation
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/tuwixo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5821e4fd40---kiwafefofudeturepot.pdfIn PDF document text
    • http://kelvista.lt/images/files/gepumujomazo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/74969448818.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947921a138d---12351947033.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073989c1ca2d---vamomur.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/99342878151.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/80318b03188151c00a16d41a2530053f/zabudexovefikidilaso.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/risibigemuvukutapata.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1942b30d84e86ed83e5f5507eda44e59/68760956786.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a53b2b1026c---78126415728.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/konirulo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c9c3b143c08182276e0266a0e9d69ef8/kuponuvig.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/55e9f1bbeb4979f9a326e97c0598f061/zupen.pdfIn PDF document text
    • http://araonline.hu/uploads/file/8535800631.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8680e64bd8371f97029db168ff7f812a/kefufalagapijikuposuwomem.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fekotuvokisisuref.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/9711862856.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/19420604648.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/24817047388.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c64bea03499a67dac18880c15fc9eb9b/fofofevodapipezixipa.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/49d67c75b552a4418c4f722dfbbbd29b/budem.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/i2ehe8nqij3chpcbph58isgge5/14648477823.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086659d3ab4a---11255161134.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/zimimarofiweduvofoseti.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1