Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d765351d8d8903c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 04:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3df37f3194c46020de110236f0547ad9 SHA-1: eb53d5c4b2f1177d6767bf8bbc44ad62aa766733 SHA-256: 7d765351d8d8903c20319bdc7ce05f683e03e5ebf3529c4faf7eaf7b2879ba7d
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs embedded within it. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9af85e41---zonegide.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://dpengineers.info/admin/userfiles/file/zipade.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/7c33de9b9c130ef0f9980ecbf1a31986/13624334621.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113d6bf90f2f---ziwatubanidigujibimorose.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/37239202283.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b13aa4c52da---goravejaribibuvolugu.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/28022725081.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5c47b917---jatizojowoxedunuragu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b5fe84b83905b5b68ad44c08501f9815/76788305866.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fcae60fb---53613123876.pdfIn PDF document text
    • https://studiorampinelli.com/file/53037893822.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/todejekigorulukasugu.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/99571555043.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/noragoladirawupalebusim.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c939f3df98---fodiwavaxixuxavonetogew.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vifoturokew.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/soxupotadakafitusenawaba.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ffea69be---xiluwevudureza.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e270196bf49---72643199377.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9af85e41---zonegide.pdfPDF link annotation
    • https://xlspandoek.nl/userfiles/file/22346396901.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/71108701857.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949b8a8f37---61031608416.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/4857330266.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/26089630974.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/pokutewupufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+see+snapchat+profile+without+addingPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 11076 bytes
SHA-256: 84488173870e03cec4a0874945b3dfd4856b94f62d4904efa69237441af10faf
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 17632 bytes
SHA-256: 1b8fa2308b9092a379b0319127ff349173c37515aca0866724c1498de14bd737
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1