Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddf650ade23bda2…

MALICIOUS

PDF

86.4 KB Created: 2021-08-11 01:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b7fc8bf84e8fe3b3010d76c880fc8be SHA-1: a5a52d0c528b84e3b56f596854b1cf27c6968097 SHA-256: 5ddf650ade23bda2fd4836f6f42bb1a69dd434644bd2bca432fa54dcd76e5d1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes a link farm hosted on compromised websites, likely to obscure the true destination of the payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.thaiboat.net/image/upload/File/10966142293.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06747a7db3---kemijisutox.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b98d127ba092b21ac9963c32e47c0340/72143061612.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7025055e91---duniziwarugunomuxododo.pdfIn PDF document text
    • http://rajakedua.com/contents//files/nipegedakujumujotav.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kunibamuzopibusanenazito.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/85449495162.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/41225182825.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/pipatofodutejesusafev.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/9750354514.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/mukujon.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/bab5796d0322c619f1749e8d09b40433/nonolewe.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/32615d9957f42cc28673cbb41a03b7ed/96483249821.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e38b06b0f2f---51097050419.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a734c6151---70335764448.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/110e8c0cbe13d9e8b78b4563b0449ba0/98359967377.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mukigevuloxusaxofobe.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dc155sb70u8adcgmbkpqcsg3jh/ruxebinexenobanasovimemo.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jebarenuwajazimugavorin.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/zevegetarivitizoro.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/73961254766.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/32109386956.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/woraxixatukaxebinazitu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/02cae3c7a145ac3ef2b8d344d1e56187/69179399593.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ea3e0509---rosamapiwadiwuker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mac+os+bootable+usb+big+surPDF 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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 17892 bytes
SHA-256: 5041358bad1b77bd22fb733eb39705df6f8a24878f7e9ed8c37f64ea1c393457
font_01_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 10532 bytes
SHA-256: 42741344ec8a0b81de70acac9eccaaaf0152fb5ae95550495d414e000579cd6d