Malicious PDF — malware analysis report

Static analysis result for SHA-256 321dac4cce6e9300…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 12:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9de7284e9984eb2b1e635a2da633b080 SHA-1: 7b5f47d65c47404e599cf145ab41c46dfa56f91c SHA-256: 321dac4cce6e9300ac4e5427d27bf878dedce27f4ca753d9185bdefb0452ec45
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=which+are+the+omnivores+animals PDF link annotation
    • https://giustofiori.it/file/26875194601.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/fusavivumarir.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/69272053011.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4nm2jaje2puj9ncf4oqeleitj5/rokefa.pdfIn PDF document text
    • http://ipllaser.in/uploads/vazonasijaxanunubafosevu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e824clb1s947rnampoa13c49ml/51825691278.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qhmoits48r530tqdv2nsp5oeb2/sibamurin.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/dekoruwutibaxuzobiruk.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/918ebbb9f1903368985463b4afa35335/remoweduramaj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u3slgfqk707qpnq2ncih07qep4/8980772400.pdfIn PDF document text
    • http://robbes.nl/media/files/sogutodojalid.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4r55gjqh7erdpcvhsrm5cbg9jp/9545263238.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7fd13efb---xuzalijapoxovazesoluxavub.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t35p1ath7ce9usjr99k1ok90bl/sozagipizeteviposi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b61bd7fee49f304ef2cf7d2d463195c8/sifuzesesanejapij.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c859286f9d---41475684823.pdfPDF link annotation
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/6dadfa10e486ad5caf178ea9c7d2f10f/pakujazivuvu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/36453580275.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/jerejajevugax.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124eb88415---99686439829.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16096542c43f42---vafivugopopu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2grbk8ockbb28sf9i1eq7bio74/33261087600.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e14ddf14bc217741688f42c42392c9f1/bavevebotojatawodu.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/19507036837.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/suzafuvilazewoxufodo.pdfIn PDF document text
    • 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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 10556 bytes
SHA-256: 676b28b2511723973711b5303e467578dc9e265dcb7bbe7e9a50a85ecdad71a4
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16832 bytes
SHA-256: eab458b55d0db632faed2da56d7be15328598b3a1eeadaee86bf7987ba47177d