Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad7702e9c44cbbe…

MALICIOUS

PDF

97.9 KB Created: 2021-09-08 00:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b5dd383c3b711cf4e3de90d3fa5b9f9 SHA-1: 4931b565f848c167b849d8a39093026435d392a5 SHA-256: 4ad7702e9c44cbbe2fd1fc168fadc4af531422b320f2e1dc63a866697782130e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, many of which are hosted on potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fd19287bb01a6d0b992c7fb6d5ab5bb1/jekufojifize.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/fekoravukesote.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/9681080437.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3b7f1fd692ffcf2435aedb48140e60db/17712871433.pdfIn PDF document text
    • https://soechi.net/userfiles/file/nezuzaratuzus.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/21ddv9697vcvh8ch09qqsabcb4/diretupegesakakodagobi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rs4arbdgoorfdk83ol5n3hshf2/vemuzedonitefikuwuva.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/99292097220.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/27608805083.pdfIn PDF document text
    • http://e-menu.hu/editor_up/6605044180.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc336868900---81708502660.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248f938fd8---37065160898.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/dataziworijuxejulusof.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/75557424772.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/83937731404.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/3618204550.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/9e3de7bc2c1795ec36cf0bee6a4df52d/51821387340.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/mobumalobifusugodifovi.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/61514484098.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/giragesanu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/82963eebadcddce0f7dd40da09cc63a8/paviwosavedipufu.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/nukod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lully+lulla+lullay+satb+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f700.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF700 18772 bytes
SHA-256: 6fc96ed9663cfa7ecd8479f57cc318b5873d83166647f85444c32d743269f035
font_01_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 20196 bytes
SHA-256: 1b1d849abfc5a5604be350dd82af5c3af3f183d0124f1d3a3b6274c85bc858cb
font_03_sfnt_off000162b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B2 10252 bytes
SHA-256: 8cd418f33121abf6d3469af564eee2ba3bc939195aff04469948dec2139bede7

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