Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28bcc479049671f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-12 03:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc07803c7abe1e98eb08279103a36237 SHA-1: 63a9aa1bad98e08b286c1b373c7e2148c857f516 SHA-256: b28bcc479049671fc9e41a7c7c243c84b77a69cca27f30cd08359ba1011c9812
176 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it's an image-only document designed as a lure, containing numerous external links, many pointing to compromised CMS uploads or disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://zensushialiso.com/uploads/files/73330337490.pdf In PDF document text
    • http://ozkayalartrans.com/userfiles/file/63365348625.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/jababi.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/26894497402.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/76546717518.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/53864690767.pdfIn PDF document text
    • http://turatabor.hu/media/92570077664.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kimexazetidajuwa.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/38293134539.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613299e3bbe46---nuwejurevigorivuj.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/xavazosolesukuzodu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/633be8f8ead5eee561daa3c39da16da0/tuforomawuvejirirapopo.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wuturukukijapanitelujox.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134efb06143b---67138631531.pdfIn PDF document text
    • http://prosquash.by/data/sevoxanibalufegalopo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1d51294f719d2c640ba73f59d463f52b/rewudo.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/likoloxizuvog.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/gumimati.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/vakepijoxubawuzavopijese.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af71e4f16e---jojezixuwunowi.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/zuzex.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/18305122509.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zixoz.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/94980899466.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/41132432527.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/nerugadonosoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=360+total+security+android+apkPDF 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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 11180 bytes
SHA-256: 8671c4cab0b4f05c2194cf23c026e1f6d915934b8c933fe039251c5900681520
font_02_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 13796 bytes
SHA-256: 18819214c22084a3d3130d16fa398ad15eddbbf6f6f97c6fd33f52b33331da8c

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