Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a20ca1fd583bca2…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 11:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 007a7fa270e011698d0363b0c9cdb0c3 SHA-1: 1a984bc8e37fcdce20d0ca6e3fb0a47cc7bb9a0d SHA-256: 2a20ca1fd583bca2bd013be78e7eae97d4a3d2a4a086790670a7dae65d69fa6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ML classifier and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or SEO spam campaign. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://3suntech.com/UploadFile/file/20210629022653615.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/875881778.pdfIn PDF document text
    • http://apgindia.in/uploads/file///xomupate.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d759747b44---72821193140.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/dbb255ce0dfafb4ed8c4525c2a067d53/balogu.pdfIn PDF document text
    • http://com123.vn/uploads/file/rigevugudukanivimusulaf.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce4fe6609---74583610923.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/86866347720.pdfIn PDF document text
    • http://dgjst.com/upfile/file/melerajujejoxabulop.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8e1bcbc4b4a3a365b96f636300703f42/37888028653.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/10333836951.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gijexasurozu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b382a5eb---kagimiviwev.pdfIn PDF document text
    • https://people11people.gr/uploads/File/30783275118.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe243f9d2---zizilijaxamitewigeduguf.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/pubikanodusewuzezuras.pdfIn PDF document text
    • http://normel.org/files/upload/file/ritujokidokewadabo.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a35ba455c---sudelisasefarawuvija.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/sitib.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c49f0ac39---zitug.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd973559d6a---sogofarex.pdfIn PDF document text
    • https://computerzone.pk/file/wilijupiga.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vizabasomi.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/30411026876.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06ab80813---73121509992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=geometrical+isomerism+in+organic+chemistryPDF 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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17264 bytes
SHA-256: 5fc05339653a4b025afc1eb35a9ffaf954cc37a11c9c9793bbf35644d0b8497c
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 10828 bytes
SHA-256: c52561ebb1436bad905976bed92f71110d25d2d8f56a75daa10b0e6ea8bcf222

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