Malicious PDF — malware analysis report

Static analysis result for SHA-256 721156702a12578b…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 01:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 18c23ccbb0c295ee80bb7d084ef65789 SHA-1: 0754f087159b7a3b3a4e4e796aba6f6c6f46afa8 SHA-256: 721156702a12578b6cfdf26fe20c0d55898924309eb1518af38219fa383a9750
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/dozuvugaxasupizud.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2346c0f76c173c73612dbf18526f3187/sumudewazosepi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fbaeb831af1a07f910b1ef27ade96ec3/zelegudegaxeni.pdfIn PDF document text
    • http://www.centralperdana.com/file/21955412532.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/59843183267.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061815321027.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/72472757214.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/67157070128.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519174945386820.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/d3cdb116vtfc1673550mqjeue3/63178250343.pdfIn PDF document text
    • http://clingac.com/d/files/42487141919.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a663cac2e55---fenoloxubejizuju.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/vanixikuxaxagenimawekow.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/xoxusiv.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/bafevuwinem.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/93292666172.pdfIn PDF document text
    • http://i-dron.cz/data/file/kajedavigivisoruka.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ues1ggssgdh2n7uit07j6k2rsm/17742811064.pdfIn PDF document text
    • https://majubesar.info/contents//files/rijafitejopuzulipobowux.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/kizaxufogufafaremenagini.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/80315849521.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b847e6dd7---lekivem.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/418735995.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/62078560451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=latin+quotes+about+deathPDF 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_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 10540 bytes
SHA-256: 23adf200ee5302ddf7ac7797a195643fb3bf22d0b3c906355fe8c0a0ad069ac5
font_01_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 16896 bytes
SHA-256: 39c946e6cc98f8f1e2114195a031ada71d29b63678dfc3ee3478e91ce8d577d2
font_02_sfnt_off000142f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1