Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e114acfd87a4b6a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 00:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d349c3701dffaa79b3ee592e03f9e89a SHA-1: 4c056f1ae534cf412ae8ade56495ca56b76a4ef4 SHA-256: 1e114acfd87a4b6a26c51b36170fba76229044ac1017bbcd4234a0c8fa899d47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the primary function is to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=congestive+heart+failure+foods+to+eat PDF link annotation
    • https://www.pessin-location.fr/ckfinder/userfiles/files/54843589978.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/656907b5dce063a58e88063a4598cbe0/110278466.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210621122821_y3dywn.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d4c3f27c---sapepatafusozevi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f08a9c978---53535144298.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/rijufodi.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/13569748997.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609633d24d44b---disabi.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/fowotejaf.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/dezejifolananafupe.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/19733591576.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df286a917---vozaxujujebamu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160888c7b939a5---savib.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xagagutoxiwota.pdfIn PDF document text
    • https://cowik.pl/upload/72782855541.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/28957237026.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6ffebf9b8ae501c3db0adcab7efc7c69/47492224456.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/gagopowetalisiditewa.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/35779452675.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/83b2d8b45cfde3c0bedf92dc89a9b62d/9547110755.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/kenometeviripesuwid.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876f119bdca---dabizoromofumuduromefu.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/lifopamut.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_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 17024 bytes
SHA-256: 56cee74e1a4d29821bde8ad3834598447fa56ed61e94ce24867a51fc32e99b78
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10832 bytes
SHA-256: 1591879858c6c6cd1d159941083c6dceeaef5e100e8d453ae9bac18a712cc9de
font_02_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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