Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec30be536f62b09d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 14:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a712bbd5c5086dff1b35601fc32f6343 SHA-1: b11424506396b18cbce27fca75e0e1d6f106f257 SHA-256: ec30be536f62b09da1cca21c4bad15efe41b581888eb3a0905b65cbee249e66d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs likely lead to malicious content or credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=ortografia+3o+primaria+pdf PDF link annotation
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/95925470886.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/legozivef.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/2865679748.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/83056592497.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/fetesulugevizepitapaxekas.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ae12efd96bd384bfaba3874b9eff94e4/lonogatuguziwi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363fde80f4c---48265990013.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416618c580c---11226259906.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/68525064126.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/52909400350.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_153534.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/36882460977.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/sefuzi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144909481310---vuferiwavotakudujuz.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210906045257.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/19496984430.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/9125154661.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/xukopagarerakisagoxi.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/32081537901.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/suximem.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/navupifipunegavodat.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/rogasofafobukunupewuxakib.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jikaxoziponokezu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ad0eb99ca---tisorofanaru.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/63051516462.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10588 bytes
SHA-256: 042cf01fb3baa71d0229229e933a688481e25f629ca8f2ec308e18bf1e3e224b
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 18740 bytes
SHA-256: c96691264b51ccb42e922ed53682d4354d9e5216af1629ab5e6b66d39c5014ef

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