Malicious PDF — malware analysis report

Static analysis result for SHA-256 886d43f321596cfe…

MALICIOUS

PDF

100.6 KB Created: 2021-09-01 20:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5073f20c374e22543af57b51af6c15d0 SHA-1: aad53611cd94ba489f49044fee8c1cd9f3d7c84c SHA-256: 886d43f321596cfe340ac0b99b55e2ca6868b75e3bf830e49c525811e8862a44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://leguido.net/files/68238138078.pdf In PDF document text
    • http://seoulgreeter.com/userData/board/file/89734851402.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdd810932---44276730722.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f78c735d1---57979805998.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9de2a089d---7401584265.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/19119497088.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092754ba980d---kekajonuwubil.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/15781336822.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/82168693722.pdfIn PDF document text
    • http://castel.lu/userfiles/files/26983389741.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/tufokozedi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254a2701127---pegelaxozuzazober.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baac20420---6703849294.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e01f02690a7bc571cb572e988ee6274b/51391822876.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaeeab8779---webaganupotagalureka.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/kj328dsv5du4rqihhoo9ikebhb/41975635328.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3bbe879b---12274326957.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16116d2fa1ea5a---56480242815.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/31930250080.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a97429db5192e62e5eb3169100205a12/poxar.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/oeie83kss2ca1du0ufnuv7anl5/jigaz.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vibogusobakagemadesed.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/sikasezuwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=west+nile+mosquitoPDF 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_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 18620 bytes
SHA-256: 7d72670a07ff8ba570cabf5bba54d29a08dd3ce4f1bb450b7f63486d02e98d4b
font_01_sfnt_off00015477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8E 10244 bytes
SHA-256: eaa9f55339ec64d208629e2616b627f90a05d5b2a9310bc2862e87b7df02c09b

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