Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7631221ad3bde0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 23:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d41dbc62876cff53b487028d8d504adc SHA-1: b1e81ed26ace2d2f56675b8656aec371cee0f729 SHA-256: ef7631221ad3bde0c2f43c14ebd7e68d4997a0aa1e8802169a77a79918b008fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, including language related to lotteries, prizes, and parcel deliveries, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. While no scripts were directly extracted, the presence of numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612bcbaced970---xezumopiwugefonapof.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dc0988d61fb576347d29fd28efe50170/88863066934.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/98454332040.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6db1ee313---venovopukovivo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b163e36fe6f---loxomasisawexinudidufako.pdfIn PDF document text
    • http://reylab.com/userfiles/file/54074165730.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/45294591069.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/87355868632.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tujuxamusodudevun.pdfIn PDF document text
    • http://eva.am/files/e93c7b249e321acf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b788e7f2906---gazowaralegara.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865b1e4ce76---8476548493.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e106ae142---38515510757.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a366cc3c53a---dikalamavavudekafop.pdfIn PDF document text
    • http://cl-pub.com/files/files/fusuvuvadagigujak.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/mizinun.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/93530650617.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4da9a5a6e2bf5ba8da2fce59eff958e4/kapakexovototu.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/16842909241.pdfIn PDF document text
    • http://ativn.com/upload/file/dikeziv.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131122a498e9---jigoje.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/64576532729.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a750fb6cd3---39133914651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=qualities+of+a+good+leader+essay+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 18460 bytes
SHA-256: ec981d91cea54446a3d3b80a75d7a1a5c28068dfe0f423f3b85e3ba9582ca7b2
font_01_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 10840 bytes
SHA-256: 4899be5a34a47617ca7d352d7e51f4fdc43571076522ca9b55f4497617b05411

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