Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d14ce09cb68f9c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 03:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79d63c3f3f4a2b862ef12453202a9f7a SHA-1: e774ab6565699a907d4976d7033a56c83cd3b344 SHA-256: c2d14ce09cb68f9cc1228eabab3530458bc4b200a2bfc3aa1cfc5a49232227aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=the+sorcerer%27s+ring+book+2+pdf+free+download PDF link annotation
    • http://activesolutionelectric.com/images/file/98494408877.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/47575564539.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b22067974---88970279520.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/25710015136.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/zinanuzojatiwukumubejena.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/najizimevuvajatavevepez.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/mijigubesaxixezajuj.pdfIn PDF document text
    • http://weingut-suppan.at/files/25736945210.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ceddd9d653206d089b9658cbef90cae1/38586986701.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zumixanagevalabelule.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb32d71519---ruwuvama.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f16635a0f---resibowozutu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/deam45j71lhu4uils301oifr10/33913446896.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/gojudi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607879467cd4a---48458723427.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xijujarixar.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/53eedbc48f488585a05d251ea2a3a38e/lamesuzikizaludodi.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxev.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/83312448709.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/82842256966.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/pudipaxumokilugopetezew.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/1039307037.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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 18612 bytes
SHA-256: 353094014431ffb4b0e1f3cccd24ecb9f6b55089e5d863e426a80cd7e425ff29
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 11236 bytes
SHA-256: 102f7509ca3ba56a78b8b71a2932d917039e51e944759817f6cf47263b4bfa03
font_02_sfnt_off00012db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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