Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12266b55c5e24b5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 07:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2628eb7302642efeb088406acba6e494 SHA-1: 487bcd52f0c851bc685d5dbf53d7ffb0aac123fe SHA-256: c12266b55c5e24b50a6aba74e8d5c22b55f7faf7ba3e010afa94dd9f1dc2ec83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious activity, likely related to phishing or malware distribution through a link farm. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document, which is likely delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4d7b9faad94063ca26ccc3be0935f609/zuvofoju.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50edff61721cd7fb677738a9d23e0929/wovagowabevexibug.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed9a0122a---1655366237.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/o3c4s5n91h4hi6u1rvnbbna0p1/78397503061.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf6115b0c7---zowapojinalufatijajo.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/102f6e405b4663f19ec0ae3cdf089f0b/23931547585.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/781179ea004807d408efcfe3301cb497/junumuv.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/miwesazeji.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/pasiwi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q8gbq23heamrosiu72a8a2sn12/wemufin.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/73863219760.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/46491286541.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/divivimopejuwovujofone.pdfIn PDF document text
    • http://gyobel.itpublic/file/87803402935.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/95873518449.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210822094222.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/48771590935.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160faadd37e71d---67571591577.pdfIn PDF document text
    • https://tomas-music.com/contents//files/jerogezufonaga.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca059480c7---95523990685.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/31323138083.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/26756865588.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098c042b8296---59291383708.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/62303833394.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5829c154---73347563506.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/924833256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=corruption+perception+index+2016+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/65128743288.pdfIn PDF document text
    • 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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 10932 bytes
SHA-256: 50b1a91e26d94131e8db8bb24d39ec4beefb6bc5a5711f17b939da7bb015d478
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 17244 bytes
SHA-256: 1bdae087b2a28a121890da2c74d4f05f20ef26e7465ea742aed452f0a7785cb3

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