Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcac72a2647811b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-21 07:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64d5a32af3972e6babb2e36794ab3679 SHA-1: 6d4b2af63c7e953ab8ed3ab5769ff46ab4c66e79 SHA-256: 4dcac72a2647811b88435f35aeadf42520fce4d22395e4cf49406a4299b2bc67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to various external websites, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or perform actions beyond static document display.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://archism.ru/uplcv?utm_term=how+to+download+rlcraft+in+android PDF link annotation
    • http://vanguardhungary.hu/userfiles/file/2570111465.pdfIn PDF document text
    • http://kmsenior.org/file/files/79930841638.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/nasazaligilugu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/veginivulofegenakefa.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/3573503451.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/juvixipirur.pdfIn PDF document text
    • http://suurelepa.ee/data/file/rejolo.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/40704328863.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/54507697067.pdfIn PDF document text
    • http://didopack.com/files/rukiligixaku.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133582083783---gemabenagidezenepaxatoreb.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/fapozenopemiwufuj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613634e331f61---2016721809.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/38193939479.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/57937989541.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/29369241274.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c0mc7voqjr6qsb64hg26pfndvc/10812147402.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/pumuralazudomemumu.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/jorozexeribivolez.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/muzexakazamesidusetez.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/posazitimoxiwiroburewonod.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/bewajoti.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd0fbf67a---97128168353.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gisorugepurasom.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/84004187056.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/83105703056.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/rofetajupenebixevanamerat.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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 10248 bytes
SHA-256: 708bd97f410f95d0be8ea61155a0694366602865e7f52955a19b0985a14b5644
font_02_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 14284 bytes
SHA-256: a678b861492895740dea3d4f2f36bf8860a9b082e9ca40bda5d6c210ed5ebec3