Malicious PDF — malware analysis report

Static analysis result for SHA-256 776b772851682869…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 10:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 917549b36828cb1a0b63a71c20d5cdb6 SHA-1: 6ffbc5b1a5cd8362b042f79d67d50cedba58e88f SHA-256: 776b77285168286954edc985ada20a1a309571ebe9d8bd6e7c3bc16462f82d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b0c632a64ea652e2001db72d4c348b9c/xasoka.pdf In PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jifopapidunukaberikep.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bb901208---koxid.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/64986730227.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfcf9da50---xusoreje.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vobifugili.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/dixuzixetafowalodav.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/lalotizozebazominefalod.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c418afdc2e2---12173826941.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607358c6cba6d---59861196186.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/s3lt1e6t7s4uj34j5igufk6on6/93201468448.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6098e42739---58494770392.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0eqankotndnsopccvlee25fi8l/kiboroz.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4d4c5f06eced79d4722aa7ecdb5dec28/85767656206.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5d89160c6177a12980b6648eed952299/31961484469.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/98078348592.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/67744acf5c19345f6eec9056013aabff/7396034766.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b19e53c9---mesuxujutavum.pdfIn PDF document text
    • https://codecs.roimages/file/38227560687.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9af5eef86d024d4e4236d66a9438ae81/lepaberoxuzukalir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=casinos+and+money+launderingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 17052 bytes
SHA-256: 009e6983acaf196231118cf19f54a0dd255438e54db56d00d85a9f6391569861
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 10740 bytes
SHA-256: 396ccd1f4bc91d021a68de3d2049f02256e2c1bda21bdd02be5416408d66e309

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