Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f144c03d71262f3…

MALICIOUS

PDF

65.1 KB Created: 2021-09-17 06:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 876c8215e2071efac7b918dc4169636e SHA-1: cbaa4715a91f50dc4246799ee7d2414ca7258566 SHA-256: 9f144c03d71262f364ff4b2d5492f6044e45e00df991d23e6e432ce5f6fa78ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7498

Heuristics 5

  • 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
  • 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://moretonassets.net/userfiles/49606590406.pdf In PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/jojevavaz.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338364cf0b6---ruwotabetumakilirawelu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/846505659ac806230453073b44d18312/22444205871.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/vujezogemozitezupo.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/ligopabosifevuzigem.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dujuvobe.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/16305946796.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pujasivilatusagikamobofes.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/59614607972.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/gotolejezede.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/92731049381.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/embl54bcal2l5g7f95dpn08kq2/toxuxegeseferugezazax.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/simumunu.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/94339993473.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/96140468148.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d74b01f4---buronon.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/5847390478.pdfIn PDF document text
    • http://chicopharm.com/upload/files/takofevasaxogapofelijimat.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/35115256009.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/jonimom.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109170816371868.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fimugisubonetasube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=blokada+vpn+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 10004 bytes
SHA-256: c1104ff641717b38a6cf64441cc08f2b5e1644bfb775587fce8c6fcfedc017e4
font_01_sfnt_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 17420 bytes
SHA-256: f24107ca470acc001a34b8e692de4c898d48cbc1e8e6ec6fb25b8e404564d12d

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