Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a07913cc5f0f23a…

MALICIOUS

PDF

98.3 KB Created: 2021-07-18 18:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f8679bbe00729f12a8fc2f70e0b8fc0 SHA-1: f2c49134373ad776d3f7a8f50d94c3c65cda841f SHA-256: 5a07913cc5f0f23aa5d0b5ae8528b25255e8b53e2b808e90b90194654ece313a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The embedded JavaScript likely serves to redirect the user to external URLs, which are often used for phishing or to download further malicious content. The presence of multiple links on disposable or potentially compromised hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://viboot.com/ckfinder/userfiles/files/52634679619.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n9re296llvp0hgv1rtenb118b9/3759119095.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952d08bcdb6---bisowikowededepizulileme.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/wufedovexelevebi.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/7200526985.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d30d40c95f083086abc0e9861f5ec70e/68141712314.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/66228607714.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/posuwitonefo.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/68159996140.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wixorujenadusuwi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c5ni4fm4vmmcnl3nvjd0s47kg7/80757172263.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce9b29f54---tituwewozepetusesewab.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210605/file/16228654772416.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/384862989db57939448c4bde452897c2/82207628181.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/47027163568.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71b4ed9ef---26358829266.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607768b0cfa69---dijidu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/zemupodemo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e569a805---xabuneposozi.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gagujaduribedasivovanivar.pdfIn PDF document text
    • http://rafaelokazakov.com/file/41722570159.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e450c6432---56192976922.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/8c695431aab97360d75c9e6348e036ef/72929367079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sustainable+tourism+pros+and+consPDF link annotation
    • https://mediaget.com/userfiles/files/pililofilibupe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 16272 bytes
SHA-256: def73f743132751be326eb1069cd23970707a1d69529761979bf59f0af6559f4
font_01_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C18 10992 bytes
SHA-256: d5e49b0485a1582c87493c2fb51827bddfe1452d9e6f10f83758db30a39737d9
font_03_sfnt_off00016556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16556 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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