Malicious PDF — malware analysis report

Static analysis result for SHA-256 8016941d1bf70331…

MALICIOUS

PDF

86.6 KB Created: 2021-07-08 11:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67bda8d0001423d1c2f14eae33004382 SHA-1: 099be8822f76b2601052df54eab1739da3c44f24 SHA-256: 8016941d1bf70331e00853563525feb309b5bb77beaa61a167164ddca84fd299
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of a link farm on potentially malicious infrastructure supports a phishing or distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://eyupsifalibitkiler.com/resimler/files/lofixafipamupolugolok.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160968e2b016ef---bajodif.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/18582843245.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607830c07557b---6103554280.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/wexejajuwuvifojitagadexi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855774b9d91---69521991663.pdfIn PDF document text
    • http://camonetinternational.com/files/file/66766249471.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dae7976d---dabixegufewotexe.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f89a0045d1bbbae85902f9527d8b2581/gibigigupimolalimafosigu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vorosasitazoze.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/70467074410.pdfIn PDF document text
    • https://isleo.com/i_photos/file/volukusunom.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/simije.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b9145f9a---tumoxevesajuwinuri.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2ce9a459---33977222599.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb1c85ab3---pegavobepug.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/pixofumosezezufawe.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/87951693467.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580a47b9d5---62967481553.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/79334512412.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a6ade477332be5e954d65a48af589d7d/79591572300.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/56044553422.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c8baddb06df2ef558a0da1dc6d1d52b4/61688186441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=all+gta+online+hairstylesPDF 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_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10480 bytes
SHA-256: 2f7162e89ec0b38a49545792f121690ba56dbd5bc897f9ff3e506834d1f1bfed
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 17284 bytes
SHA-256: c43feb71012b4de9466b221299de6d0aa4addea596636d34f03c38d0db7486e4
font_02_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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