Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7643889391aeab…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 20:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78b31202257cc081d351e45dbbd46c2d SHA-1: 5e8fde3e5edb5f5b8626a511fd33bbee80b249a1 SHA-256: 4e7643889391aeabf77d8118527a7baaf6234f7b6ad295edf2049bfc5cbe3fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fw-simple.com/uploads/files/80470459861.pdf In PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/91229132904.pdfIn PDF document text
    • https://reniuved.it/file/zerarisud.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1444fde8---35863152146.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/urji4cath2phngjrl3clavis4c/jakuvunutajima.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/k1ltoc6kkn8md0db2mpi9u6i0f/saligukapakimukadimafu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39515905150.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/30485712774.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb933f7a8fe9fc39bd7d4d8b0f6ff58c/muwisujawowigox.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/57942025068.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7f59e5203e410f06919e6a1af822bb6f/42666427959.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/takiralosubomigepadarum.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607465752cf65---40875344871.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/f6ur16vcs47d0olj5etm07d00m/33320670116.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/paruf.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0ed2c7f3f---vizixuvoxome.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/zipezivuxajasu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/85756160ef40f4577cf694eb805ee361/29194040782.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-21/20210821022645459430.pdfIn PDF document text
    • http://woykoff.hu/upload/file/68828047741.pdfIn PDF document text
    • https://coil.hk/upload/files/23250332312.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7035c43fb---gejekawilugaf.pdfIn PDF document text
    • https://conrays.ru/f/data/pozebulonetekemugop.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/jorapogila.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/kavinubigijelewilivopokim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=acuate+in+a+sentencePDF 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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 22692 bytes
SHA-256: 48a58ae05d6203e42090af0b3c0662b7a65e919c74d70c7ef6ec4c38ba8860e7
font_02_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 10036 bytes
SHA-256: 1cd415f0c3579136071373b1e43f0bfee663e15f64eea3d92c12f1cb930afb54