Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b395763ad3b232…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 14:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02cdfde59be33cb576ed639a9c0c6163 SHA-1: df9fa011f410901951a047db6ac19a3746f7ee10 SHA-256: 57b395763ad3b232e0905dea702252d443acfae273c4b73f67e5c5c90a9f9d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised WordPress upload storage, directing users to potentially malicious PDF files. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or trojan-like intent. The presence of numerous unknown URLs suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145eb4e4d492---tuzuvezukabini.pdf In PDF document text
    • https://shreenatharcade.com/userfiles/file/76098935724.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/ruwexafisaduw.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/478f0b2f1ad9dcc34082f680c3fdc10d/puxuwa.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/fadunanapibi.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/tirogiforetipuzapo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/zesikiw.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/62144841948.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/baguwezikuradiwekel.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/69717631183.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/54110543543.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210911_013844.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/vedanosisowikovavexixixij.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/noselipatewolegenixexaba.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5c6b9a2c08c7b1e949ffd0e460728557/13053551598.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/lidikarisotifilodoj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e8b82fba---23140997186.pdfIn PDF document text
    • http://ubest.ru/images/file/35019267879.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/56256147095.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/26888312104.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nipaxitoz.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa15cc54a2ede9ed07acc1626e293eba/salujagijiposaf.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3deaadfb6---mivisuwuvemagon.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/rererorotajejinole.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/seresoluwik.pdfIn PDF document text
    • https://onlinendttraining.net/files/fitapipevijiwegerid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+set+ringtones+on+androidPDF 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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10668 bytes
SHA-256: a45a667a8c99fe0e0767d745199405155105f3c3375e4cccf5c7463ac4e711aa
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 17428 bytes
SHA-256: 6a437dd486dbe741eb2b0ed6fffc63391fd6b6593e68d19d1f778853eab2dd22