Malicious PDF — malware analysis report

Static analysis result for SHA-256 733f90313013a33b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 08:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 142e30d078100524c7f0ec0c788a97a5 SHA-1: 661b3027f6da73bc94d5747490e90a9f428aa9e5 SHA-256: 733f90313013a33b13f38841ebc2464dac31168b698bee514d4fdf7514543516
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather as a mechanism to host or link to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/gawopo.pdf In PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/rofinekenemugubelepa.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/90b538a66faface734afb78c3d0ef2f1/63060898573.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/57029134354.pdfIn PDF document text
    • http://zae.me/datafiles/file/30027969643.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/10633756234.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/sibonusoxuraxuvawazutoba.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/21612711346.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/zusawavebarixukesafitaw.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/30359767327.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/19314807440.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/7234216389.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/8868aa5c9927009f4b83830f39734c26/88600686691.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/gokelotinogasekifetupo.pdfIn PDF document text
    • http://imaginove.eu/data/Files/zefanoteb.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090202b37cd6---62402564594.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/49282849366.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/92169998875.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/35576137662.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/78217735289.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/naxofizetex.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0f00d97c56228e214fe0f6ff2eab8a13/18881366113.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/dajakegob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+biology+books+for+class+11+and+12+pdf+banglaPDF 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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 17068 bytes
SHA-256: 0bc7c73507fce76c72f7e3fd17d8003ebbb243be84d4e29353e12334a0e96cfd
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 11168 bytes
SHA-256: dcff117fe971eeb4a824c45cd5a1f5b717212c55fc0d76b08b51198dc88a0be6