Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b57321d79e282d0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 03:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5624c9d83069f1f60953413d0c1ff4b4 SHA-1: 96d0dcc7a1d02111fbe684501875241f0aae3f9b SHA-256: 0b57321d79e282d0aaf3adc37b8c9a822aaa8b49edee4a26b969a7c29570333e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which appear to be compromised WordPress installations. The primary purpose seems to be to redirect users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2a4114dfa---10242723505.pdf In PDF document text
    • http://gleneaglehoa.org/images/file/mawobulesibuwijutozopuj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cd84bb38df2---jezatituzazegaxexagabo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dowiwugirunivudadogejur.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/26181171214.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a92a69e07---97964430468.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/ragupurilufoxerapub.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0b529b62c---supifulibufa.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/8578986215.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/lixixu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090452dbbaf4---74478966418.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/vipogiferokafanolobepij.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/posomisu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rskpptbba337sq39umobm8l5ui/78138824529.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afded529dcf---kigepifimuxedifimoruf.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/34822018145.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/sifimud.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/47601345181.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/61790334564.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/romemibewivifitudori.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/84197751497.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a30e46f80---56947670759.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/65786810207.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/44820678959.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/nufixilurotutamak.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/78159025055.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f530deaaf---22696855846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ohaus+t31p+pdfPDF 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_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 18044 bytes
SHA-256: e29a43ed916e1740f772a152b01195d8b95efb9e366cba83e401eb83d557da49
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 10348 bytes
SHA-256: 43c5fc5fd92ff1b8bf799ed43b2a95beb60eac7bacdf3cb89654d7ef5474f44e

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