Malicious PDF — malware analysis report

Static analysis result for SHA-256 783e703ecbddc45a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 08:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cfc816425d9a756953bdb5ef23a3432 SHA-1: 9d30f95c2c415d3b1501ade6a889f5e6f59cda06 SHA-256: 783e703ecbddc45a91ef35169e30113d33a8027bba832a8c18f7ff606dc05552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host or redirect to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5faf93dc5---35666894095.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4d522f60b---90345945277.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d805ed4f822---vazafobesatuserop.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fifilululo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/jopezabokowogol.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/badexepi.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/wixapakobekiwabifiloler.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/74169696061.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0a102434---71347744211.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/nodopigorelibubel.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/zikabetevisuti.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1b80db864213f2f503de9c8136417ae3/51990983122.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c2de96704e14809ffef1123443db1b06/72712841229.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/84438500890.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/munokukabikozedewi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/822d7d32dd6c2a65c965176cff58a5ee/76579176196.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oomifv66ocbkvtvapk5e5s72l3/pidusujivafegasedafov.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/melukopirapawakusuxot.pdfIn PDF document text
    • http://bdn10.cz/files/file/96651381559.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tokorejaleludolixite.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/l4tk3qght7if3h5jbrds2650r0/gideredixobumenabapeba.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5afcf18e421fcae7dbe2062554434c7c/mogaxit.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/dawipudakije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=blood+bowl+norse+rosterPDF 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_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 17824 bytes
SHA-256: e208756fbb7c6b13c37b7a45bca04f28922531c679bf10ce9c69dc0533635588
font_01_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10264 bytes
SHA-256: b8827bcb91947ffd0acf6bf2cc580a35e6a0872e70254579cc607c912c6074c8
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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