Malicious PDF — malware analysis report

Static analysis result for SHA-256 1711ec2091c02c20…

MALICIOUS

PDF

102.7 KB Created: 2021-09-19 12:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8a15713d85aae5af6cb4e93726e5e0a SHA-1: a5dcbd0be2fc1b90f8b9fb4ae3577cfdca9e2c8a SHA-256: 1711ec2091c02c207a56b0674b9f80d4442ceedf6ceb11659edd56cb5f3efd4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 http://dok-vo.ru/userfiles/file/28361291400.pdf In PDF document text
    • http://ilturismoinitalia.it/userfiles/files/97095627340.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3cb0cb9f---kurefivuforenirupike.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/96130548767.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/50025440469.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/12768515101.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/zifusawududaporizupiweb.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/67832731365.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h9lhrbf54esjrj9teipjqdvh03/70505896758.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/tafetakesuzizabuw.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/78126969917.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/74853628569.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/77825787467.pdfIn PDF document text
    • https://asiapharma.la/files/files/8170175986.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5407e417---pawizo.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/xapes.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/kubatutipezu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gjops9f84eq98dbrum3iqgoks0/32359921760.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613041db3fdf0---zuvomorilovojufomafojuz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340902a7f7---gamebotuvidadogud.pdfIn PDF document text
    • http://gabortech.com/admin/file/pupezepibe.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/11053761298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=windows+media+maker+for+windows+7PDF link annotation
    • https://lapdonline.org/file/jekupanolexar.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 27768 bytes
SHA-256: 5e6eba6eac88bc0f8511e92e62469e47878351c9c34704a2a70db0e9c9a3de76
font_02_sfnt_off0001549f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549F 10592 bytes
SHA-256: c43b27ee307723abf889e6c2c968bffe4b1cbc549672f3caa035d40d2167d470
font_03_sfnt_off00016cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDF 16504 bytes
SHA-256: 622ca1015fc4a16a777c681133e35c14cd0017fb9b99b6bc732bd8ca1b6c2ec0
font_04_sfnt_off000183a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A9 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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