Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1972c5647194fef…

MALICIOUS

PDF

70.7 KB Created: 2021-07-16 09:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8104243ab24249de34fc929acbef1747 SHA-1: e28dac1c414cd38ce40fadbc57bdc89f49f11a31 SHA-256: c1972c5647194feffdbaeefd3cc6361b2bace4cc4aa007bdc0a55f53d7a417bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608756ccae59d---birarezapuguzu.pdf In PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/11545500326.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/damusuzim.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jubuxisapixuvafulo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zubavodujofapalotavefu.pdfIn PDF document text
    • https://btegypt.com/file/diwujalitodig.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/80145543341.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16086f53f0a54d---6739727949.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/47257150075.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5f307833adc765dba6ca33d8d573db2b/37632939801.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/88658832426.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/96636224725.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/76111364891.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d4a4753830dade3576365c73792fb376/subasavodemolawulusos.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v45d0eoasf67ej005hkkh6j3t0/bikemisuvepufot.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3381e7a5bb.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/diranofibes.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eace69d40875e5add73d1ddd9a8a3d45/79660064143.pdfIn PDF document text
    • http://keacg.com/upload/files/92355127091.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaxiv.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/ligumipizokexotejepamigup.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/96600033553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=f2+boiling+pointPDF 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_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 15020 bytes
SHA-256: 20ecab40ebb4824249faf1ba0a8acaeaab69363f3304a5b6d5394b150a3d2b84
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 10104 bytes
SHA-256: 35562bbdcd7d3df25564ed0b912329aa5f6111907f165daa9e9ad8c82aeb9236
font_02_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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