Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc878b5d3fafa7db…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 13:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fdddfb753a1edc5f1cfa06b85e17807 SHA-1: c603538e4b8722226e81d9675a62a13b33000ffb SHA-256: fc878b5d3fafa7dbe91e65fb9b02df5aae643d23e05282df7fb0e901434c025c
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of link farms on disposable hosting and compromised CMS uploads. This suggests the PDF is part of a campaign to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/47d43cfab8b0e2ee30a6bc1860cd13af/83322259052.pdf In PDF document text
    • http://linza-market.ru/upload/files/23820700514.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/189fd9dda7142d8ba378e551b502ce99/tesut.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gabopezasojawebadesax.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607189e8c1460---75613267548.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061800141257.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/9624121143.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/dareresavutakujusadozi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ea9961e0---61136752099.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610054a88e91b---468351527.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/19714901786.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e830bfd09a3---70604977054.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e975f172e---lovidodidudil.pdfIn PDF document text
    • http://agavietnam.com/img/files/31508263884.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/sulajadolemixa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/60858198117.pdfIn PDF document text
    • https://mlspoland.co/files/file/5007452464.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4cc0eb6798f35eee1f7d69fdbca2dbbc/98103118936.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/panuvaxanabuki.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e38f5c6b23b6b335b46df8bc70469a2e/14247844052.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/73176613992.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/59246578264.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8495f6ca87d503ed43e485cde24ab182/75540027126.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c132f6165e6---kefipabozevezop.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b972bbfacc---xunazusorisurasosu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/jaxazumaxawekixotero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=clindamicina+ficha+tecnica+pdfPDF 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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 10528 bytes
SHA-256: 3f8f70f6e7c28781f1c28f53753e460a49246c214616d6eefce3f28b262232e0
font_01_sfnt_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 17428 bytes
SHA-256: 0ed857f79c36a2eea40f03be1e776983268290df2779f08e8e3d83e387603b39
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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