Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dff83b21d17346…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9cc078a37162c64e13482f791ab77737 SHA-1: 1f5927c3c5b7d569975357f64aa6df4d52d661be SHA-256: 51dff83b21d1734675317531da6b107814a108a30ae45b7d0ed549774674759e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://lagunaapartman.hu/images/user/file/kelurogage.pdf In PDF document text
    • http://sonarkella.com/userfiles/file/73706473225.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207da09766---kedadupodivutedu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/loguwijoxitewojidi.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lubodozuxej.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/dipivinujazejosuk.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/51344406137.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb6708db8---65838844660.pdfIn PDF document text
    • http://www.depomatrial.com/file/81194514418.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/guligaxodesotepuxanipomo.pdfIn PDF document text
    • https://melz-feu.ru/upload/kadodofopigivivi.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/tubexoze.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jeripugovumikigulowafasow.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wegisugemu.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/vevolaloguxap.pdfIn PDF document text
    • http://secretinvitation.net/images/files/dezisomesekelus.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/95552492999.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/15140988746142de46b6846.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ebdb78b3---telubiz.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/28239690656.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/sokitakozene.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/bujabitixobalekurumaw.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/53892397339.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/85672300014.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bejopexut.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/90078444534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pawan+putra+movie+download+mp4PDF 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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 10716 bytes
SHA-256: a016c8a3ee83c431614f9a8f0b137164d1b17a961213c746ffc0fe49c68b1d3a
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 17600 bytes
SHA-256: be7cb8871815e076a013df9314e4956924a7c8e4123a7d9704466929f71a71c5
font_02_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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