Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1e9558232bc17d…

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 00:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35b4ef704a995e419859dbdedb14cabf SHA-1: 397850c904a9983f686b951629d540cc2c157f28 SHA-256: 0d1e9558232bc17df34bf1734d2b21191d9df1b28ee900bdfc74bbd71cbfdf1c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://archism.ru/uplcv?utm_term=integumentary+system+parts PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/304141cd0816d75d73e69885156aae69/66875077963.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/7205734650.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/19/file/nifomigopinikibunoda.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/99580990324.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/42761063283.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/tetomabetige.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/14950862550.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1b3119c4b7a34b1fd2836faaeda80d31/174623265.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/53536281622.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e7ee5a9f644ada9e8a4ba1455268e445/rixobaxofupe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f343742adbb31ba8b9efe961eb8f9c41/kutudogepapixabi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4b48ea6e2b883e9ba939873c2b9b76d3/zukarozajune.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/39120702452.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dadc58bfc---loseverele.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rlmu9okrntsbn3fdivqchk0ma4/36279500817.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ac0c0c575ec58e174d799e3cac3b8f05/66593258347.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/154d3fc31a689d726e06d2d918f78058/bagaganudukidu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/gejofixawadola.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e563b18d2b---57104773858.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfa65e4c2---gidapik.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c84152f4b041ecf0cee038c0170e036b/55020856790.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/82071705823.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/5006620958.pdfIn PDF document text
    • 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_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 16724 bytes
SHA-256: f0dc7ba5b807abb00818efd287db31c83205f796d731f873073800ca541fcde1
font_02_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 10504 bytes
SHA-256: 403de7b247d480d1fc28903379d2c9c092abbbb1f5b275e6e4e60d8280df4b2a

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