Malicious PDF — malware analysis report

Static analysis result for SHA-256 df30e7765db6828a…

MALICIOUS

PDF

76.2 KB Created: 2021-06-25 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29add7234c57dddb8428c4699c29fa96 SHA-1: ff8451b1a9111b9926a65f07d2ae5cad246b50ba SHA-256: df30e7765db6828a2ea5c9204408d12d50c88330b9677e7ed8fbddc92d4a1c88
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of numerous external links and the 'link farm' heuristic point towards an attempt to direct users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=percy+jackson+and+the+lightning+thief+book+online PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kb10o1bllra9va0s58741gg8a9/79839054169.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080982f2be51---41496003571.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kijuxabanupodi.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6d38b02a7547f37e91d1de6bf1f9c6fd/67449133471.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608136095493e---13268107451.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee217b229---28450086152.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/rifogukovimozad.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cf7f574fec57b171a28cf4d627e02119/89041021906.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20889363832.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c727496982f---xibifizagokaguwutagit.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb143cc7b---34939363859.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e84efd849f---muzogotazefaragekevo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b1f0f6atrj5oqn925lj18ij005/43090943544.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160901ee085fae---tafupopul.pdfIn PDF document text
    • http://ledins.lv/cms/file/85899818323.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3602d9e7b---pegaw.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/85249742520.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7ab2f1d47d8da4c6510a8e515bb059ad/tizasupu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/588e93a9540e6ba2b5b339e1130c72a4/97770807355.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/monatan.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jezigafadowi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dalakufuke.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/dumazusupev.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/8obr49ov13bhmcvvffp295kd4t/96293606605.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6a137125jghmp64cmrkik64615/66685319625.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_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 16692 bytes
SHA-256: 89be224dfc732f8a485c9d5dfc9f1b2ced99aa6df0fe10b2d0aea2921e124ad8
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 11232 bytes
SHA-256: 9eb2255c33a6cb7f7b4156511e9eb0905e1190dcaae261ddd675ff55a582e8d5