Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55777f60c1c9554…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 05:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32b63675ac674f966976a58aba7c1b01 SHA-1: de85773c7e4e17f42d2e7f96dbb5fee2993d223b SHA-256: d55777f60c1c95540287b05a442ae3be0db75a7f4ccf732568bc1c568de28f9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=brawl+stars+i%CC%87ndir+apk PDF link annotation
    • https://beysukonaklari.com/ckfinder/userfiles/files/fetumunexetubodokase.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb748d2cffb3189b135a27fbf3940dae/nozubapori.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/53983357906.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/73425949258.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/rovuvoposaxazakeweloje.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109080932489696.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/39594398223.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908193140.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/likenumeruwoloxemijufoxe.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/vemago.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/20381904926.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/kukos.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902090514.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc59fe2073---98866004049.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904144918110.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/wepomeb.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/79017257037.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/68957592004.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a8eb8e97da3cdadcee13138ab3cfcd3c/dazilawesitonozenoja.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/rigesenojapi.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/lezafaxavuzo.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/gozikofefevizegu.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/bevoxasadamajerabi.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 10476 bytes
SHA-256: 8009d0413cac85f8ad01be1cc566cb4194052f0fcfe3e0f524651bfc621aeafe
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 20028 bytes
SHA-256: d7c5d78dd6a1b09760b792786ecd87d5f796f3e865b6782e63c0f6069327e42f