Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5dff1dc1fe967f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 13:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cb3f9d68aef4394a34d2985c04cd0b24 SHA-1: fc8af6704144570c22cc3c8caf864b599eb06267 SHA-256: 0d5dff1dc1fe967fcb04c53b58054acb14c3346467ac1c5cbb9870c56b9ca6e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://funbugs.ie/files/file/pajapolekuvedaw.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/87ee8db2f902695118241a8b2feed225/xagewezekipomesivogufa.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/galewidilup.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/disofojeteduboxefej.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/bogixurukoxirowes.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/juveseko.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/kolekaporakube.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/kurusejazo.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/12476390512.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/55819926323.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/97495720986.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ab480257---91347126506.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/26765836861.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/zenupoka.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/baridalafiberofufu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613096718394b---badolenaxujukog.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136cffa512b4---nogifibuzezu.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/16248505474.pdfIn PDF document text
    • https://codecs.ro/images/file/70854954597.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/xotibunowiditewuwoda.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/poxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=as+i+lay+dying+pdfPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 17300 bytes
SHA-256: 07f245aef00d511a11396515bfce08029862c70c375aeb8b1ff15f393afd4edf
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 10316 bytes
SHA-256: 94274e0242f1e0fbd65665042ca413d1aa69396084e1c068e4446966942e901a
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1