Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f56c8ece7d808c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8a4c147350c62eac23ef60f49604819 SHA-1: 8fc582f79bfc66769e1bd6195b5af2df61a03c0e SHA-256: e1f56c8ece7d808c87db10f4c0860fb23ab7a9f88b81e2a0c38c0ed41d015f24
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on disposable or compromised domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download or access further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://interface-referencement.com/userfiles/file/89496261984.pdf In PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45561897986.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/nebajapituguju.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/ponuvafisuzefoxubulufimo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8cd965e9c26236d09f2badedc1890f9a/wiwigakupasodetidem.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/retapaw.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/81947604363.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/kepumidisa.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/nirusajutejawo.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34361595386.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/60952187579.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/wipazutukop.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pixejinarazap.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/82611118856.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f97b72c2bd---14636707782.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/518fdd3ac6910a50bb3607c0f72e9cd8/38593500696.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b1ec1bcb99eb0546ddc577abcabcf0a8/sorezotufupajem.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/xinekemenu.pdfIn PDF document text
    • https://km2804.com/ckupload/files/53444939567.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/91998017540.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/jovuzusidavino.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/tufuged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fifa+21+ppsspp+iso+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 10396 bytes
SHA-256: 821de6e6aa7a1004dd8276a44840f271942005d115fd30d20a4fbde70f3452ec
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 17292 bytes
SHA-256: d07ba28d81702735b7e054cb48c3c97a799693aed3f35df0449c5ae21398f18a

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