Malicious PDF — malware analysis report

Static analysis result for SHA-256 86749d8d72308b53…

MALICIOUS

PDF

98.1 KB Created: 2021-08-06 22:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca7edce13b78f92ad4fbec5e4e7974a3 SHA-1: 7122c4d27b27978a189e70c13726946be517cfbb SHA-256: 86749d8d72308b53c2daa6fd0ef52ead0c0a52cb0acc9e82765d6b34d5bb9ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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://allytemp.ru/uplcv?utm_term=abecedario+en+ingles+su+escritura+y+pronunciacion PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b32d7ef03---gexuvifepudumonu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/q9ukedvvp57nhk4sv89cthgkf3/64440793368.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c4c32753---figiledibawezise.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/miwimagenadafugowoze.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/16922786336.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/dofofape.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bu081u0cuce8qrjohb1aie81r/mikezutemofodop.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/73d2f3c1b628079d11399109217957d8/56756203844.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c35fe59cd---53375689911.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/58847974976.pdfIn PDF document text
    • http://mutitar.com/user_img/files/wopigujudanorifefunulod.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jajuvogujus.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/forexejara.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de20e91578---gugumifobenekegutila.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd9d9db4b---59007007039.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39f86858f---64009765664.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160741e4008ece---82667675803.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/99509014879.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/72012098514.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2007540442609eb2d08a857.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e783ab17258---kodoxoramapakekipiredi.pdfIn PDF document text
    • https://combrooncom.com/contents//files/dulipedufakabolob.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/94733125874.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/81ac359550e23f913ef69d1e7129f2b2/66332438061.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/nofiletepakewezovabo.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wevativelipurugila.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 16092 bytes
SHA-256: ed2b9b5c515e6fec3b962f8774891732609b722831d00251b997b3fa142be98f
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 25544 bytes
SHA-256: adda7bf2a23ab73c059c3d90eba4d0e4e344e414180e8ad5de2a27d4877aee39
font_03_sfnt_off00015e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8C 11024 bytes
SHA-256: dd86ed77c84c6b9a7a2540333e63ced4cc00dff8038a925f85e1169a1119fd6c