Malicious PDF — malware analysis report

Static analysis result for SHA-256 733e0e1889a53903…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 21:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e52386d62245294dfdd05bc9675402f1 SHA-1: a8457d0d331967b053244c6966f717705e7e8de8 SHA-256: 733e0e1889a53903ecde366cccb5f0b30601b149c4b0e2d254f27ffe8f1ae6b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

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 https://infrive.ru/uplcv?utm_term=vtiger+tutorial+pdf PDF link annotation
    • http://notariocprietoa.com/notaria/documentos/files/66169769614.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/20318761665.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b30822ac0316a518599616e027b3a968/buxorokefedasadijajawod.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4b5969bf---90598517336.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/34204885547.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/53689486129.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b534dbf3---noruzikawenusenevabajiz.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/61679585348.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/65358324114.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/xozote.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kuep8ntujrjjha7b8ha089m1ih/toxufewaxisevegu.pdfIn PDF document text
    • http://fluorescent-training.com/file/fajoma.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/84792a2b88ca4da485154915b850986a/82078274058.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///lazixagox.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/90955437682.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/5164602135.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ef76007b---bajizukuxuwezifijefotu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b071e090cd3670404e86f9166ae535eb/lixemidoxijobibozorod.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fba42ee2fee---25635518305.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4760676e8---lirimerefowonawi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161049490c2b05---66644824684.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c851b1dd55---magazixipim.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/48934750004.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/831a68eac9509436bb4b1e59fd162485/nidode.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jot1g48bret6ffh49me7qklb30/fivifivugesutupetotekofo.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_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 19160 bytes
SHA-256: adea7f1b448f22b135d137f56fa149b8f5f58f182cb3a1096fe3a02a3d86b880
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 10468 bytes
SHA-256: 84966bfe56093e2f57d277bb4a13661da85cb9ea74fe7ea076842ac217b2e52c

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