Malicious PDF — malware analysis report

Static analysis result for SHA-256 6628ee1b9a71ea44…

MALICIOUS

PDF

92.1 KB Created: 2021-07-02 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddeb977717cf1b1f2e4ecc415c8db584 SHA-1: 39b553d56cfe97d193285b7ff79d9a1929e7a1b7 SHA-256: 6628ee1b9a71ea440a3496cdad0d92b50f3ce41dc7c3911c479aca32d113ec3f
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely to distribute further malware or phishing content. The presence of a 'download button' lure reinforces the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2d75381a---fuxezisosolojowufolep.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kn6c2n3nv7cbme284bvket6gl2/dulakazabakibu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ac4ebef64---50892788343.pdf
    • https://jotekonybakterium.hu/userfiles/files/latajik.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e11e3502c---86667737236.pdf
    • https://parklanehotel.asia/userfiles/file/takuvomanatupotekojolur.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a49cdd12d3d---33965220743.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc35dcbd0---98627891759.pdf
    • https://menu2uplus.com/images/file/50701013327.pdf
    • http://balone.net/_upload/file///40803789228.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90896e5e80---14937308098.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/b14541c17e03f4a143c9e9db76db5a30/xikeviwogituguxidoboj.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/34700142016.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qlcn7vaeu06glbp9gs0nvkik64/gomanupuxuzosokisidu.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb76f062ccb---53361403329.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5e0574a2---boxobubonazewepimip.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac25271ef---karunor.pdf
    • http://groupkaishan.com/d/files/53830982626.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b81efb7a---14645633434.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52f1834fa---madinutem.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f57cbae2---67465575718.pdf
    • http://arohitourandtravels.com/userfiles/file/jonijiwixonupulonasub.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607960888f545---vufetewinudelokix.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sosisajaja.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/87be246bf5a78e40739ddf6608085837/82561675196.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0256701a---simaroju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tilapia+and+mashed+potatoes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes
font_01_sfnt_off00011b8c.bin
b34e55220f15c7f876ee8185406a898096c61cd2e132d4cc4effa8352c96668c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 10520 bytes
font_02_sfnt_off00013340.bin
a329b2cf1374caeaff3067f506f3ba8c15cac2c23c22a973dfe7155ae9b24312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13340 18396 bytes

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