Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4bfc8c5f330bb5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4adcec1a65268e1173d2cd8c7ebebb23 SHA-1: f1a880e99314d1458ff2ccc838198560b5ddb2b8 SHA-256: 3a4bfc8c5f330bb5efd27c1cb09d4b3e64002759166fee8cf0079da1d896f38f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://archism.ru/uplcv?utm_term=how+to+export+one+page+from+a+pdf PDF link annotation
    • http://hungthanhauto.com/luutru/files/29815255330.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/5514766922.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/tavamezejupopakefizoxif.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/wejomemikugivolido.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kalasikiwaxafejisaduvum.pdfIn PDF document text
    • http://spakimthi.com/upload/files/wusenodopivupasogo.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/57691748010.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/93813185525.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613431897b4d2---21985039231.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/46712277129.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/supix.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/fobonarujuwenajupowuxo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3bc107dc9---paxejuwepanadutomulo.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/97326183317.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lakutizonipibozudapo.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/gogekafaro.pdfIn PDF document text
    • https://ka-base.no/images_content/file/babevuwotupirezetoderar.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/47546741823.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494e8490a1---pinore.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/fejosakubudefazipitubetur.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/megaguvajuvogudekexa.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/vodavumagegukijawab.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109091534053228.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/kofakonavapegifomerewevif.pdfIn PDF document text
    • http://warehousetraining.ie/images/86381496195.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 17640 bytes
SHA-256: c1424da8605b98950eccaf02e3f2d4f1a8768db340e7cccf46dfbcfb4f4fc114
font_01_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 10716 bytes
SHA-256: 22c57d06b680d3c33e2bfb7ea913b9284b1ce5968e2cdc23385e2f64222a8a8f
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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