Malicious PDF — malware analysis report

Static analysis result for SHA-256 67818f8f594dd4f4…

MALICIOUS

PDF

96.8 KB Created: 2021-08-02 02:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad17412cfeae155a85f3de3a6c919c26 SHA-1: e1503ca631b4fafcb9e316ed4ef174db6bcf5fe0 SHA-256: 67818f8f594dd4f4d649706fa6f82f9c7a8f79543dfd17b8971adaba468a4c69
196 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, with specific heuristics indicating a social engineering attack (ClickFix) that prompts the user to execute commands. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lure the user into downloading and executing a second-stage payload, likely through a compromised link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://biorenta.lt/ckfinder/userfiles/files/pazejibiguxonuge.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d03753b49---27336975041.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/14637755513.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/lilibulikozuvabupanizirob.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9a6733c31067aae4abe9081b5bbbae73/jotirafegujinidopetu.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097390d08b10---75874966287.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/dodireriva.pdfIn PDF document text
    • http://citra.cl/userfiles/file/zakaxasoxebobomaz.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/sorojob.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a397fd384d3---10556621614.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b499d77f806---28181062913.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xeloxazuduvuz.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606caedceb641---72802108765.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210630_222654.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b76273e69---xixiwenifivax.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/dipafikenuvasape.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/37116914853.pdfIn PDF document text
    • http://viticoltura-enologia.com/file/87012020580.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc9261c1664e461f2d5d476078c3d891/xumejukiwasavonumerofaro.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f8ba228d---63655575739.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/88552522590.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/verafowodenijakixo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b980da983---10531199646.pdfIn PDF document text
    • http://dannguyetltd.com/upload/files/56519938900.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/39454784546.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/71598629634.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/9210478761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+treecapitator+mod+1.7.10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 18224 bytes
SHA-256: dbfb43eb3eb70813ec8bd48bf2b2bf4a18858d504ccee7fa7bd8a084fa8f8bf2
font_01_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 10848 bytes
SHA-256: 4d3cb0d274528373093f0c29f229e3d9b33c58e09b9729ad898c4fcf268d618e
font_02_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_03_sfnt_off00015b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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