Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c4d513ec987e48…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 09:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9971c625b90eeb96f1cc6b9586d4dd7f SHA-1: cc020b1c0154dd1e8dd61cd41f11ad9b85e46f95 SHA-256: 25c4d513ec987e48bd59942ab43091703f34c1842e7114dbb42a8ca56b8fb9ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, 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 embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://073741256.com/uploads/files/202109111550532779.pdf In PDF document text
    • https://milorem-service.ru/userfiles/file/zopijimajad.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/dejekadezifibutadut.pdfIn PDF document text
    • https://jjpremiers.com/files/vifujunuvo.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/60057530311.pdfIn PDF document text
    • https://akemi.ro/hirek/file/35515075139.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/32177541086.pdfIn PDF document text
    • https://cncunse.com/d/files/51766440665.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/nufekakoxerex.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613a11061087f.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/pexoferamomumed.pdfIn PDF document text
    • http://zl369.net/userfiles/file/bidudojaduj.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/63307463692.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/96635798458.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/44075975257.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/belus.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/gepamawusobof.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3a1ada2e6daf01a3e3fe992d8f37b26a/6866099422.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/54292428084.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/81482737229.pdfIn PDF document text
    • https://costarica4d.com/contents/files/12249004476.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/nijutanedusejivimuni.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1696972354f82295c0cba0085ca3f84a/senuvopunokamiv.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce82c5b87---bidilazo.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/49853187320.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/tisebobiramagufep.pdfIn PDF document text
    • http://brlairport.com/images/file/24926031677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tubidy+app+download+for+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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 16760 bytes
SHA-256: bfa42072e48909c7c7d692809a7528bb8cfb4c470753a478d01769b58d8e396c
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 10496 bytes
SHA-256: 2795cb626953879c1bc51b5f045cbd087c2e22dcb91fb3e6749e9131f85aed25
font_02_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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