Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b8277b93cb8d67…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 05:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41c97f54e57ba169e34a238d9678ed48 SHA-1: ef54414aa2c1fc0ed8baf6258ad31d7541daeb2b SHA-256: 44b8277b93cb8d67c1104abf7985b0a08c4400dc1fe7a14285c010ac3385d623
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://thehouseproduction.net/file/xibomitabogonuvudinut.pdf In PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/67883661569.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/63950781478.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/mutuzewax.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/57840940910.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/woxozewuvudu.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/gumezefotine.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/43967994431.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kexowalemufe.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79671506243.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8b3e8a4712db84ab6d9ee93355e66640/3486989334.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130278ab2505---parukazuzetates.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2c0c83e1---xakagafajowa.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c376cbeb7---63104159969.pdfIn PDF document text
    • http://sro52.ru/uploads/files/38243491231.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0ccad56f---77168142221.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tupavubesozu.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090310213273499.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/88079893823.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/97828003347.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/86403350602.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090504063333.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/89640525401.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/53471480787.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/91184794237.pdfIn PDF document text
    • https://premium-house.uz/images/file/manosunoxatefajo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/lifodumoteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dr+fone+2020+crackPDF 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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 10260 bytes
SHA-256: 454512f74ddabb0410c3746d866c35e515b57ccb422ab1be11281d4efe17fea2
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17740 bytes
SHA-256: e7f8cc13b30c13fa3d798f6aef04b428dc1e52b669891d07572a66e14e05f8cf
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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