Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea4d49eceac987f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 17:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90efc6c3fc2a70f94bd972ee42820e87 SHA-1: 39d0ae4dcfd5ceae2893b0ee6a5e8930092d351a SHA-256: 5ea4d49eceac987f593b155f25317302e764bee2306f6729e4bb2383d05320f1
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains. These links are likely intended to redirect users to malicious content or phishing sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://allytemp.ru/uplcv?utm_term=what+is+a+cousin+in+law
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abbccb2aea8---sagepifivigobemazibugefot.pdf
    • http://dienlanhlongan.com/upload/files/81961640540.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/94511152173.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/bumojose.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467103f353---dopixuzovurariv.pdf
    • http://bclgrouptt.com/userfiles/file/bejuzetajep.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4281553f51---fewesetivezupexowom.pdf
    • http://schodylux.pl/userfiles/file/59913569886.pdf
    • http://closehorses.com/userfiles/file/xupiwoxiz.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8a2de091---34142287723.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/45265152728.pdf
    • http://agcslohian.com/userfiles/file/27690909751.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803d9714c3---47453929245.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ec1245e84e8e928d734fefda445420c4/69887970539.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e76663608---segedugogakoditinuni.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc129790af---xebasapuw.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/t8c9d39c0qrhrap1asjsv9acr2/61381625487.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5497e1283---nisevorisutodokemiwuvoz.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bef3dea80fa9d65edf4118fd91831383/57499563591.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a1d09110---defakavudasapirejudo.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e78907daa---tojaxelokaki.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/02d7226b92ba6fcc08448369298e1ae9/zumejovedutik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes
font_01_sfnt_off0001041b.bin
a48dda80d76359fa504a61d8359453b041f89f5884e131d6e0b04a6d1565e4a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 10276 bytes
font_02_sfnt_off00011b3f.bin
e0eb71c6a722f58d2851c283f353531a5553f3b458820d2d73d50a38805f1265
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 17960 bytes