Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e158fcc376d14b0…

MALICIOUS

PDF

79.5 KB Created: 2021-07-07 18:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7783765a4184b64eb525c9a4e632e833 SHA-1: d3a712af95e22279933e8b8880a40bcdf0e0d5ca SHA-256: 7e158fcc376d14b09f9e1ba80689c6a488eb4746575b7526408b00d224be3ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=recalls+by+vin+number PDF link annotation
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607841d4e5d4a---simejagixuwogorixisuxifid.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/lezagejoduwefixixazutosiv.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/33249652058.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jc6egf8p0it7rl5me2cgvaqfqf/liweninosuwi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ddac6a797---tuzipaligarufatamone.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac95c5ce---30283270421.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a07c389c8---10550699769.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vazabawamipixoler.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/xasetajugebofog.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b05d5af7---femufare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b6714eff---rekixivategibidon.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/87543835601.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7b8bfb4a926ccf2664856194f1d19160/66209729169.pdfIn PDF document text
    • http://wirheiraten.de/images/file/xenuranufinuko.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/1615169822.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/bugovuwararudivumevizaf.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/nikusalelawawereraka.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ff802c9d423bc7f245303640f7ba3faa/wiwona.pdfIn PDF document text
    • http://capital96.com/userfiles/file/31312396067.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90301293920.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/08798184562850f4b6fba4f9dbf00d24/92665745564.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tifiwari.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/612mr7lusqtg9bsa9beee3h0ek/46511868549.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/wikizogasananumipalerivob.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c10df425---75442735735.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086389ca1521---28574699329.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/kasurunikeremimotu.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16444 bytes
SHA-256: fae5cf438088358bd1f57e7b7b44e7238f91627d33e86f12b9023723d82057de
font_02_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 10640 bytes
SHA-256: 1649ad264d3225c649f0695447e3cc00f47a8e6708368f0ef9bffb1a4ac70e90