Malicious PDF — malware analysis report

Static analysis result for SHA-256 38904a98c4f6ceb0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 15:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3634fa73002c41fee455ac29f82c2e03 SHA-1: d04c602d8b8b5772a9355b8c969920c8b90c5fe2 SHA-256: 38904a98c4f6ceb068491d2ee097a659838395fafcc91c32d4591826aca6a5a0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://smidgel.ru/uplcv?utm_term=first+potions+class+harry+potter PDF link annotation
    • http://mertcelikkapi.com/userfiles/file/46090182731.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bujutimered.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/89073844089.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/febezijixele.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/97065274412.pdfIn PDF document text
    • http://groupkaishan.com/d/files/86425069708.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nusoneke.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/45086110527.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b1e5c3b3---lonewigezapilineleta.pdfIn PDF document text
    • http://tcihk.com/userfiles/posalegokimixarinev.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4850398d---zujew.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tubghu1hc98131pct5o3ijakj4/gixas.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbdbbadd1b---14563887683.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5ha3npa5m5932pgvpbjrlvgumj/75828377322.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/62433478108.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jexikizemujodeg.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16111774055.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/wetamil.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zulagitivogupe.pdfIn PDF document text
    • http://coumert.com/images/file/tomakapesitimiderapeko.pdfIn PDF document text
    • http://belean.pl/userfiles/file/71287352138.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/zepovobupakepigalivu.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/44763313384.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/74268640477.pdfIn PDF document text
    • http://rubensova16.cz/files/file/50221635339.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210918164357.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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 10564 bytes
SHA-256: 0b56cebf0b1e39538f78a24674e73e3035fdb01a6e2d7302eb0256271ed22428
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 17832 bytes
SHA-256: 13dd832cee0eb6f8e8fda60cb7aef76a698f16fd0b2dcdd98fb54af04241a677
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1