Malicious PDF — malware analysis report

Static analysis result for SHA-256 badf5e77afd8348a…

MALICIOUS

PDF

68.5 KB Created: 2021-09-15 11:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8956f9000a052c07b22c425ce48603cd SHA-1: a9f57806b0f51c7b19e3697c0f18129a518846c7 SHA-256: badf5e77afd8348a394336734ccef6a11d848bb1de519c8f2dc3bfe979d8332e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=subway+surfers+unlimited+keys PDF link annotation
    • http://daiduongmetal.com/uploads/ckfinder/files/visozurezugudopewamejaf.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/xafujavamuwad.pdfIn PDF document text
    • https://coil.hk/upload/files/vibixot.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/zenitaj.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/namawutalovemamaj.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/renabako.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/vubobom.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/rokafubazoxevaj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/madezimunavewapegubol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407e33d972e---mosutisafevevipore.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/zusivijokepapupev.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bac0101d---15754428824.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/11781333826.pdfIn PDF document text
    • http://chamdure.com/DATA/files/60424090317.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/zawixam.pdfIn PDF document text
    • https://edgecs.com/documents/64945141659.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/bonuvinexowolonilajapu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zejiwuv.pdfIn PDF document text
    • http://reylab.com/userfiles/file/geroxefukemix.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/mitivimidafole.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/zikikogibebifedudiloro.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_off0000ad65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 11000 bytes
SHA-256: ad3e6022d41503f4c948653580760f022ae72d04a7989354e24fe1465fed1e01
font_02_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 14984 bytes
SHA-256: 6feeb4242545a7c55d390ba972e7a7adc60d963343ac5bb6bd26d19da00bc7c0