Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03a032492c838ae…

MALICIOUS

PDF

98.3 KB Created: 2021-08-03 19:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 55122257eaedbc509c6c2d349b916cc2 SHA-1: 0d0020f837967e63d9bd33c3ee64f515eb649596 SHA-256: c03a032492c838ae96f8f795f77ccc9d10fffa6077194770013a036d2d2941bf
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://citadelcaralarms.com/userfiles/file/muloki.pdf In PDF document text
    • http://corghialberti.it/file/62466088610.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/50620306709.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb1bd56c3---34825196561.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc46835e571a28b1487a905cdc668b2f/zululuvo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/61601995536.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbaa6c16e9e6c67c1b8422264d1b0156/75934545956.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/56115058306.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/43737108023.pdfIn PDF document text
    • http://candientushinko.com/images/file/nasuzakipisak.pdfIn PDF document text
    • https://samtee.com/admin/images/file/40771390228.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/wivapowiw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e0acca44---48350280238.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e8fdaca90---jafeji.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/50694897377.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dofil.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/eeb602b9e01a4a061d6d1cb49bddff84/fetipaxezuputolasure.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/60647328732.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/kiwaxujutetuxasowas.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/3360877194.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/wuferupujipaxojibamipik.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ef5323a996cfd1696d3959f1ae48fb0e/varitimimemabaxoxomozir.pdfIn PDF document text
    • https://agatanorek.com/files/file/15019864400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+diary+of+a+wimpy+kid+wrecking+ballPDF 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_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 11196 bytes
SHA-256: 65166a98e929b308bf6bd7cf209288d7698cd43494561ac84054396e8f37e164
font_02_sfnt_off00015022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15022 16564 bytes
SHA-256: 45d1a896d08e2819f701467b5f092ade8341d4feeb098a4ca347ea308a68f894

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