Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6fceede2888aa1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 04:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9834aa1afa577ec3127f0f1921beda74 SHA-1: 4f4302ab4f42bd83f87b5beb1e5a5d16f7a5f46f SHA-256: cc6fceede2888aa1cb11bd86d0ca6e3b1c9349b6da55b8e93479b70773b4cece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external sites, many hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mexxeopaint.com/upload/files/zidukalifizomife.pdf In PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/206130242.pdfIn PDF document text
    • https://tuinvandecruys.be/file/golubitogisakadiduvebozu.pdfIn PDF document text
    • http://ossokahve.com/upload/file/63696647967.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb8acb84---gomeg.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/97003121089.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/fomaxudibopenilok.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109041055577948.pdfIn PDF document text
    • http://xfswchem.com/upload/files/22955064151.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/60132579609.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/jedudezevaruvuwatolu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc0f2b6e9---tivarakije.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/jararilarofizekegajolin.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384b5edc5f9---wexexiwemopegasewijonof.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ap3apqfg17m9q7s9t87l61jh2b/431470637.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdfIn PDF document text
    • http://stroi-sistema.ru/img/23803208412.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/35487380420.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109020707551985.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210905023059_262807902.pdfIn PDF document text
    • http://www.toptehnik.si/images/94937890647.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3e743391566c1193d7218f744766ff4c/lizofanip.pdfIn PDF document text
    • https://kapefashion.com/files/files/77852524949.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tua72ea8q14avru6v8vms5ltj4/fazufebaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cs+extreme+androidPDF 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_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 19616 bytes
SHA-256: ecb20bf57b54b022cbb1a185b0123af38db1adf40ab848240990749b0c47c57d
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 10496 bytes
SHA-256: d02f590a6e76fed7df4223bb6669434dfa6b20d4a5ad9e97891a0b1ed71417fb

Open this report in the interactive analyzer, or submit your own file for analysis.