Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f08af83d3732a79…

MALICIOUS

PDF

84.8 KB Created: 2021-08-18 17:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d1c5df50f02aba22071261db24216672 SHA-1: 2c57c347a5de6a40d77ea2f0d92128f09e1bedc3 SHA-256: 0f08af83d3732a79ea0f8768fb854bbaf9512bf3dc4b7f4e982ab2013abb9886
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dc69b58746b9c97493e37ec80c74a09e/80417318307.pdf In PDF document text
    • http://lamorenj.com/userfiles/files/taxilepuso.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eced3de9e2---segazi.pdfIn PDF document text
    • https://onlinendttraining.com/files/kivojuguloguwagabesatax.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210613_080515_3026.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gajed.pdfIn PDF document text
    • http://mamam.by/upload/File/file/47895393483.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76a545566---92687492362.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729afe4a16d---japiloviravekodowet.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/16899460496.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zesufaxedibivomapuwefo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c341b5024ce---58990155661.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d8779afc---zuzefalefagenixuxob.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tdphop8e1mverijj6f1sald8p2/78837037218.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/66676722218.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/kamusufesapomifiwa.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/zanigij.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05f215fa7d4cca19ad2983c4d3eb21d7/26871609942.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d925535224c---19555716192.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d27a0816532---75536842307.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/63678807458.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805db02963f---paxuvedeseve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=principles+of+information+security+6th+edition+review+question+answersPDF 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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 11568 bytes
SHA-256: 4ce493b54278164aeb1067a34b894c937d34843690b7c9dfc5c750f1fd1583c8
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 18860 bytes
SHA-256: b96d131bbf1f7bf8c84cc4b9c6597dd2cb98edc16849a9baf5cd8b8628c7b655
font_02_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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