Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed513476a5bc584…

MALICIOUS

PDF

86.7 KB Created: 2021-07-31 01:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bbd849810bc42d54b346982e5bd498d8 SHA-1: ca6e7ca33758a02051e28edc3b5e96a06f3ddbab SHA-256: 9ed513476a5bc584cec37181e180fc20e45724bdaecf60099a1dd13c671977a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, with numerous URLs pointing to other PDF files hosted on compromised websites, suggesting a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gabconstruction.com/ckfinder/userfiles/files/senisoxibebizuvomomapu.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff20393c4b---49544224100.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/41679341260.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/06fdafe76dd8fb9c9896c1b956b9f8f2/96456493952.pdfIn PDF document text
    • http://darec.sk/files/files/fozoxezuvopepebejaf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4b39f42e71a54ac8061a83a21b7a3b0b/vefulunudejupoxo.pdfIn PDF document text
    • https://irantruck.ir/data/file/zanas.pdfIn PDF document text
    • http://silatur.com/js/ckfinder/userfiles/files/wanimowefebolewufaveseti.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086847aba03a---91806468666.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/59c363f985cb428f605e4da890b51eef/52513061979.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e9aca663---nuvoxewu.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106300810035853.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/14175477440.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/60375399304.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e8b3ca352f8.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072657e8f776---pakusufewute.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/nubagavasiraxabimem.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/pudajifazitif.pdfIn PDF document text
    • http://art-ball.net/files/file/legoze.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa616d1b30---32139421970.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8657a133f5---xememekajunevate.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/caf839ce670380d804747da21efc9bc5/10753588573.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/87018507855.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607335629adf4---32815532081.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/82582031094.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fa11e1644---21503697489.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210707024744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=big+nate+in+a+class+by+himself+audiobookPDF 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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 11320 bytes
SHA-256: 600416e0e18cede3c691343c629d42409d7d6730a29e8ded5b375c8974a7bd5b
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 17972 bytes
SHA-256: 3d3746defb3e9dc81d6657d14a3224c5f5680c85e03127068c1ee3d8af1e4be9

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