Malicious PDF — malware analysis report

Static analysis result for SHA-256 96dfdd96634c51f7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 22:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3cae40e5765e9a4dbd6ea25b7974584 SHA-1: 7c18a72958e81428124d5b338dedf28204cd64ba SHA-256: 96dfdd96634c51f7a06ca2f2c1d37c176ddd3974505f6be752211588ee0bba15
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=giant+stairs+palisades PDF link annotation
    • http://littlepearlspublishing.in/data/eimages/file/satavorowajapamatutijan.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c37637741---wifujufosofaxevebuvunifu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a039b0b106---xujabum.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80a457e6e---bovofiwemogikitaxo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba104e9a2---48836759183.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080119435040.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/99307537859.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/od6aqdpoid1i1gctfp2lv39f3t/39343812649.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/vubepotozunikozilurabifa.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/61514258864.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jejonevigo.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/43106769327.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6uhvedukpgrdu9joc8u56n8ibj/luguzipujirosot.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0f91bb5fa---fivegegidasalivejotodo.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082943a9f599---jelibiwijapejuze.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6882e49dd245ab37ca4c48ee00b7c4b3/bumow.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/43457851758.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/21119141471.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a88480313ed---mivexatu.pdfIn PDF document text
    • http://belst.by/upload/file/wewitagepukalofevi.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sivofosakim.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/95080474643.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210824061605.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b62d31e0b---99710886150.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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 17280 bytes
SHA-256: 17556e6d9abccd38118625875db1a298d2ec45cd5cb68cf5c18414467299e798
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 10304 bytes
SHA-256: d792853ce7081ba9559a69289ab582b6bb69aad866954d09dfbb1d647ef1e73f
font_02_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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