Malicious PDF — malware analysis report

Static analysis result for SHA-256 556cc16c0b8bc8f1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 12:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2fa72adea078f4047883927e301e5f7 SHA-1: a0dc934ab6f316dd2bacd7890e143998cef2d821 SHA-256: 556cc16c0b8bc8f12ee85c93b092df2a71774662b98c3e6fd0c138cf06893ccd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a89faac205---27612533411.pdf In PDF document text
    • http://pratiklinik.com/img/userfiles/files/babaf.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/1728961850.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/paribelitekexenozi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160877b704c90c---fopobufob.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d3ea6d3a---veramipat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0139f4b4---50476059174.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/68259678566.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/nunovijinejasa.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/fiwipov.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/479d7fb6ed6c01ae31432fab86a506d5/rugiviwajuwuberegapar.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/kalekemovu.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/41353990659.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd69568af4---gemonobazafewofinoja.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf08781e9---49521024019.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3bb546bda---nezasewola.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0f32b35f34615f31d5bd79a924109ef8/ririmusatenemaxeg.pdfIn PDF document text
    • http://pedraferro.com/files/files/gisawutovusapuratefoz.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/60150519614.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/74846950207.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/maginuruvotafogibinesa.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/fewopelamidotoma.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/20396786304.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df93f1c46---81983319635.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/mubapogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=otra+vez+tu+libro+pdf+descargarPDF 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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 11084 bytes
SHA-256: 4929cbda697e9a240645603120cefc6ed173b1c74152594e278d493fd774fa9a
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 18476 bytes
SHA-256: 38b00b5122b65bd56276149d479c85c717d0667dcb755a3f2feadba1664ae2b4
font_02_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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