Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe4026ba77faa78…

MALICIOUS

PDF

79.1 KB Created: 2021-07-03 02:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6f0f49a8dfad46517723718f23008c45 SHA-1: cd917b41b12c89a45432f4468ef32854bdb5736e SHA-256: cbe4026ba77faa78c1d0143a15a6a60d4059042c2b1be0928bdb028ae75245b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The document's structure and embedded URLs suggest an attempt to disguise malicious links as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe4e6179d---niporuledokuzojulukupi.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e7acfa66---25187340547.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/88861654187.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/18231660060.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105052114183506.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/kuvanufomadidofumow.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6920973374---bugivopidu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d7nkka6ghusof6jthah2fbl625/82075094091.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qcvtm79g3q94q7l0igit5gevd2/45257539755.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/11a8vfb30g7pdm1p68nc9rako2/4341978775.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160831cf1624c2---89432461775.pdfIn PDF document text
    • http://princeverma.in/uploads/files/muluzitosezokemevufaman.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac001e38a76---67739531758.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2d98cfaca56ad94abd9012d26215193b/49977334329.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kilejusirenexorubipejo.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210608_4C4A59C933BB49CB.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c4ab0b7e8---91270408184.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/voporexo.pdfIn PDF document text
    • http://artospace.com/pics/file/62606907077.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26eef4178---84769203188.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56fbc4f2a3---vaxugafumufadojowemuner.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/dusej.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d3c58949---koxewenomufon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+print+custom+size+paper+in+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_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16144 bytes
SHA-256: cdabe6e158e1e5e91a93b89feaac5a6c9a1e980e0bf51a1e29bd7b8727ee0261
font_02_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 10972 bytes
SHA-256: cdf38622f1b61f55eeef074370828c32ac823fde4c4144bc7dccffe3fad6987b

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