Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a4cc0e926f6b0f…

MALICIOUS

PDF

100.6 KB Created: 2021-07-19 19:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f2e72dd210d854a95d53ffcf9ea991d SHA-1: 8b10ff08c39b27031f40fc558589cbd28e8882d1 SHA-256: a0a4cc0e926f6b0f8a480b96065213f1261a821a759a1222652fe4cf69b83384
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous links to potentially compromised or disposable hosting sites strongly suggests a malicious intent, likely for phishing or distributing further malware. The ClamAV detection and ML classifier further support this assessment. The embedded JavaScript is likely used to execute malicious actions or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://o-dance.com/upload/files/widuzetewagijibadi.pdf In PDF document text
    • https://ideylia.fr/uploads/file/39360598170.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d983cd7c18---zotule.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de2f6d2c117---90565017585.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/2405890239.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/99b28018622b8b0e18e591fae5cc9497/wilowunabaz.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/vadivotugi.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vapezebokegodojigegivikud.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/9369773714.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214302157207903.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezewor.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b2ve8qev1q0k5eqh13hn09ghb3/35883379870.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1969f708---duxeniguvite.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5bcef1b5---pebapizinosebofewemaso.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/luvivo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0aa8b806eac6f2f366c8e67d13fb7155/74515394888.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/38333428405.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/fitukagoki.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wazara.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/96e6f05e05db7189eabc9090e6a57796/gepurajinarunejoturopu.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/lufomopofuzoziw.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/eecee7d31e92ecacdc35cf359950cace/xijonavabizegibupexamog.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/02cd4e5ddfa67ef4126657106bfed5a4/61875355725.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/fuzefodagefiwulobu.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/pimigogu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/32982130026.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda307c560---nuxuvelow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=numb+encore+free+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10900 bytes
SHA-256: e16003076465c45bffb53c9def33670df60ac50b3a6fd7e9c68f20c42960eabd
font_01_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F29 18148 bytes
SHA-256: 700e88ef6681afb1f9d69f1f85c5c0335d0008a86bd857c9e42eda1803bafc68
font_03_sfnt_off00016eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EED 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467