Malicious PDF — malware analysis report

Static analysis result for SHA-256 56327977b1566dcb…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 16:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f642c0c99f2cfdc7c273a32319ac7b2c SHA-1: e77cbf8f24c2904dd70712f739a31abb66b8e36a SHA-256: 56327977b1566dcb7b4636b8f9f47d0d557f072789855fd66d5be820bff53c14
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files. This pattern suggests an attempt to distribute malicious content or conduct phishing attacks by leveraging a chain of compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64b19b61---bipezalol.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a149bc8b715---zirenegewoto.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4e6a204072aaa8608b542586f94a1454/16963992609.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/pidusepi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/42683859264.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9379826b---pujejikosawagaregegef.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/jizusomatofurekoziseja.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4402d449d---nufab.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160703f2526921---93425645371.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/c74d43b1a20c03fe0943270133b23fe2/94316596732.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b6243ac103c---17743330073.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/19871891b5dda3ba89511121f64637bb/senafubobiruf.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/91839871808.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8cc5540b---lumaxiwirulamotatafemabem.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798470aee9b---16359483641.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/lsoaqdas8e4fjpt7obbif5hk83/77600855708.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/736467c3cdb44cbaa4eeb45dac428265/21510827512.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d1e05917876680e33398abcbc94656c9/40190270136.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/54a5be5aaa67492a9dc1e04c11bdf8a7/mijavadudoxobeselo.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617021159.pdfIn PDF document text
    • https://auto826.com/uploads/files/xuvinitawufinanefupuduv.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/788a26c461794dfef13dcdc345346781/getewarigaxozeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=html+admin+template+freePDF 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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 16784 bytes
SHA-256: 7f3b3588619a23f7a1e62ff033efed89f4536e5713a71cebd7c8b4b1972d430e
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 10364 bytes
SHA-256: b90e355438c21960c552af94df34ada02a5a66150f5ede7bc7fd290206fc6f73

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