Malicious PDF — malware analysis report

Static analysis result for SHA-256 164f09deb2f52582…

MALICIOUS

PDF

99.7 KB Created: 2021-07-06 13:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e42b9e3e80d7793d9f1d86d0675e797 SHA-1: 97b7db83c2c6557dfe87e7435eea30ea63cb0f6c SHA-256: 164f09deb2f5258205ff34565391129768ad9bbad19d5b894c182455f5a09fee
156 Risk Score

Malware Insights

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

This 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, with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of multiple compromised hosting links is a strong indicator of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jmo4tq49kc6ierli9d7l3kn3i4/begonejisakojo.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/22162124935.pdf
    • https://alrukn.co/userfiles/files/40497036043.pdf
    • http://stardentalcare.org/userfiles/file/vupanodaduzosuvawobiri.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/904e1765895440e12215d849180f5dde/rorifekuzure.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec65934ccf---80495463322.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/79804819558.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5f1206df84e64ba9fa8471ce2dc5ffb3/girutelewowowolised.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd3567d0f---xuxirimukogilok.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ba37476b933ab2b58e1019c6e54a7d68/gezigolajomofore.pdf
    • https://gites-les-bardots.com/userfiles/file/lulimujojalojiwobileruxo.pdf
    • http://allycatering.com/userfiles/wedajubadatowezalavozuzu.pdf
    • https://daismene.it/file/nukokurerudiz.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2d30285f---85677074472.pdf
    • http://uniquehotelsolutions.com/files/others/94762133182.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/susebiposogeze.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160761833e68b1---84303524854.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dffe1253bb9---48853140178.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sif7fiv0ogr927ihsir7r2mh62/bupimeguzijel.pdf
    • https://wickedcheesy.com/images/file/ranewimetage.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e9fbd0dd---totorozubokubuketo.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b0bc1b9d---mijokosixika.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p0du1mq7pj4v3j3dhfo1g2j25i/sivemadiludapal.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc63e9693b4---remalenefipuwojip.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/81008230191.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=aphid+body+parts
    • 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_off0001251a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 16792 bytes
font_01_sfnt_off00013d31.bin
eb66277dfdfd7a98922d623514e747f1393b20dc2bbb6b231d49588bab51c66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 10444 bytes
font_02_sfnt_off000154d0.bin
e890ca1782690b29f2a43605e5f6e8498fcbebf5c5007f20cea971bf0ee08ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154D0 17192 bytes

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