Malicious PDF — malware analysis report

Static analysis result for SHA-256 28db7e1e885b9987…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 18:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 186841b0888a7a9a7041764a4975cc6f SHA-1: 53fbeefe50dc96795f19a382c63df1bbfe574aa4 SHA-256: 28db7e1e885b998753f8226cbabd132e094cae1a77b1baed5cc39b78afd70a6b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. This structure is indicative of a phishing or malware distribution campaign, where users are lured to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomorecpapmachine.com/userfiles/files/kijelit.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b53feecfc---27653031676.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/vetoladunax.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/731320501db8210da672e22f3fb2fa23/febelawox.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751c3b4604c---kiguloze.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/42623480905.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/32406529288.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/b552sg3omv1gg5eto5v7ahuvo1/gekusupudaruwolin.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/joxifonivozepa.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/ratulakinabeweros.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/16290390631.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210612_18FD8467A3D39B85.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2f33ff5---bevirosuletarebu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe803a8726---raxukiti.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/jebaxuf.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/2647596215.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/tibovoxoledilezule.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc0a3c090---67562682931.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/90375901594.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/82251183639.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6584636a12---68692263780.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c1412d7465d39dab3c50d4deabf52f05/xitas.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/ditirulu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0709531338---lasedinilepakutufogiza.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ohasbmk1ijeotj86mq7kmlo274/51298126483.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/26585802120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=jk+rubicon+manual+sway+bar+disconnectPDF 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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 17716 bytes
SHA-256: face2a122e0709cafc128d1cb5e4869f99e9f5dd8f5904970c983a7f43c481d4
font_01_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 11056 bytes
SHA-256: 32d4ecf6cafa11adcbffbca660d5a995ceac575baa37a4f118d0f966e9e11523
font_02_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1