Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70768898ddd94cf…

MALICIOUS

PDF

75.7 KB Created: 2021-09-28 03:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b4d2685bfca960964db27799f60e725 SHA-1: a1dc7cc058197d4aec1447604f28b1b5a755b662 SHA-256: b70768898ddd94cf877031b8986182fffb62e712a7534ccd4b91464678a260ce
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/20805165024.pdf In PDF document text
    • https://luckysurface.itweald.com/uploads/files/6137133ae687a.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146008e5335a---16749889350.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c04e9b847---72839720551.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/vugoro.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/43135297041.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81618558229.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jodavonudusuwadosepokad.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/nopubokovuradili.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210912035228.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/54612964830.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/86635688410.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/nademajetudibopexiz.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/waximavobemek.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/bizub.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/79092006487.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/42509805160.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7a350650---24575639146.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3a5f65f82a7595e2851c4cbf4e56f374/pilafo.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1589d3c5995c60b8674b07164be727e7/86872312542.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/42205403149.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/36197992590.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/gafabumak.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/vopebuvezitor.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/59103745648.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139197fe6d66---gitivabekijixanozidekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+kite+runner+pdf+free+downloadPDF 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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 10668 bytes
SHA-256: efdc85ee82dd014c352415d9fe9fa1b293ced249855c802d34ce7840946c8cf8
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 17564 bytes
SHA-256: fe8e8b7fd4ecf8f81681dc1ac32190c42824b68a595dccdd3b7c1c2bec15a0a5
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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