Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb55c340da95131c…

MALICIOUS

PDF

105.3 KB Created: 2021-09-06 16:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ebe3cf7613880e06a1f01b7ab7098e3 SHA-1: 0b3b2c710a1c98d5faac6bb5713fdd08ee5c11b7 SHA-256: fb55c340da95131cff717fa4bc3290b04ef67a7e5db1cfb2f2a86f92082dafa1
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and IP address literals further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091367cd6803---jenamidisavubevapupibop.pdf In PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/texoxevelapalimomowilir.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f819fc74245---66598903821.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/20569363721.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dekodekididotovikifubilax.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/migagoluxagufemefopawekan.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/velepojarola.pdfIn PDF document text
    • http://mlbcsimleague.com/ckfinder/userfiles/files/fimedoripofak.pdfIn PDF document text
    • http://gptools.net/userfiles/file/nixipubema.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/muroxodumibupokut.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ab2dc58c7---xuruxuzale.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t3edk9it0hqceafp8a7na07l56/komazenabezajozorozawos.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a8fa8d29f---xeterapelebipitesugifimu.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/53848211364.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db369cae4---20335721863.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609434362eebd---gegibubalaporujatorofam.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/67967475097.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/29797593335.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2596c411d1---naxeridisup.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/89047276651.pdfPDF link annotation
    • http://liebherr-tr.com/userfiles/file/wolorojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=odyssey+book+21+pdfPDF 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_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 18876 bytes
SHA-256: 9ef821f46be4f620c758782508e1f395cf3fb9597a22eb91066d33f9e65e0005
font_01_sfnt_off000167f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18010 10432 bytes
SHA-256: 16fcb12423f878bb94115a64bc578db81c1055aae06989a1b9d3c539d9c00fea

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