Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e1bd0ebc634c2e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 14:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0cca3e1dab7fc9d009d917880efd824e SHA-1: 4d9f9c3bacf96460a8ac8a337533489a708d0000 SHA-256: 12e1bd0ebc634c2ed95693b495d27c017ed70222c8e13764430ae8d885b0be1a
96 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness. The presence of a link farm suggests an attempt to direct users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tunglamgarden.com/images/fck/file/17061377500.pdf In PDF document text
    • http://waypl.pl/upload/File/19083136858.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/388789923610f99fa9e6ae.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/iiad7u989vdoibdf9e5p87gva1/66283029159.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877e7e8ec95---73755898152.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/87180523246.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/59299352979.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/19715790679.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/wiminibutumumam.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/libarerumimirawiletififi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7697938ce6e2c4f6ca952a335a551780/girup.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe517dbafc---memotinivunaruvu.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/bakukudakeganinatatotiko.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/genodelazuvafivosed.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/mojasofagalonijomasalitox.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/16041852463.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2251d00a9ed4ed78b703002b4517665f/denilamezazi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0449091160fad80ac318f392881d3dd1/dinomesexugubozexom.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a9ccd50121259b23de06654790637dcc/92591154229.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed15b87fc---3344733070.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/06c6eb4a097c7549be3175a83a8b257d/dafirovamakojadojodo.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-10/20210810170410353519.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/68434221549.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8d095969---jujama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=paralisis+cerebral+infantil+pdf+2019PDF 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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 11096 bytes
SHA-256: b0f0d19db3d8d2916d7fc4d7df6791739ceed610d3fbb103c50298c5a6c91c5d
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 18432 bytes
SHA-256: f3c882f7add793023620537979b3658ee1e600f95bc4449ae6428abfcf905d49
font_02_sfnt_off0001320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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