Malicious PDF — malware analysis report

Static analysis result for SHA-256 737708f55e68d1c8…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 03:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a682c876b178540bf7768115457a3f29 SHA-1: 649d719f627a36bafcbcafd35bb0adf0ab3f424b SHA-256: 737708f55e68d1c8d23dfab6ff417e1413b22252771e54097757856d82426d3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://chcial.ru/uplcv?utm_term=android+snapdragon+855+termurah PDF link annotation
    • http://hijoin.hu/editor_up/84001398205.pdfIn PDF document text
    • https://betsin.org/userfiles/files/pazakuxadixiwa.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58156965067.pdfIn PDF document text
    • http://uchid.com/uploads/file/96516959032.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/90802315889.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70187046574.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161403edd773ef---87448241389.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/56056901019.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/femenijolozipo.pdfIn PDF document text
    • http://abworder.com/uploads/files/63136299277.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xilitorizonirufulagimapiw.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/43092575218.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/15543499880.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/73489375370.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/puwimigetijifakorelo.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/roxezamukuw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/72cfaeaa0cfc2f71784bf8b4190cdc33/dezejote.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/luwiwixejinugejofujew.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/46975897161.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5d2qc89dmc8171f0gh3kped54p/tikebotulebiwow.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/gugigejebanogiw.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/miraxu.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210904011244.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/lanewe.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_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 16844 bytes
SHA-256: 6f0f7293b2610cd1959b14c343b49f0d8988cc3a94e5218d6384c3f164d4cf6f
font_01_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 11216 bytes
SHA-256: 96668d4d940e2de5f60cfaedd2a315cb9da4e7a103803b71e467ffd3f7c880c1
font_02_sfnt_off000143f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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