Malicious PDF — malware analysis report

Static analysis result for SHA-256 166e0073ca9b1ffd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 15:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7c87c9a6324d20034db072f8043e571 SHA-1: 77938af0d44dbb1d884e5da7631e702b2dabfe26 SHA-256: 166e0073ca9b1ffd15f70084ffd233a354cadb7a751ebdae58fc82ef6e3f3f88
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and exhibits characteristics of a ClickFix social engineering attack, instructing the user to press Win+R or paste a command into a terminal. This suggests the document is designed to trick the user into executing a malicious command, likely to download and run a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://bonezi.morefriendship.com/upload/files/46354227450.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f9197359c3823262c34fac7b226d0941/nosirixi.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/rumapajulufasovuzorovorim.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210909_B3599C9A0B487AEA.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/48463752973.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/miset.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/25966695547.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6abb51726---52814974477.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613526af6cfad---26012041785.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/48235137027.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/delawijavajaregilurez.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/notadagobanigipagewuxiva.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/9037163029.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/zipugerarivolupixi.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/tiluruzu.pdfIn PDF document text
    • https://europartner2.pl/uploads/20467298281.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b116abaf15---xozekurodedokabusin.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/jenigukesipaberazexak.pdfIn PDF document text
    • http://glassick.com/userfiles/file/86926394029.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/98070642853.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2924253f67b8b82d1a17fd79b8f99c12/zegidowexufajutijipo.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/riwobolikolapifumezofeki.pdfIn PDF document text
    • https://labelmarket.eu/data/file/sakedumefotuxome.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/49584323275.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/3694168924.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/xixolakapot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=open+apk+file+on+pc+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 18468 bytes
SHA-256: 26a8653411c1742c379f5a7ff948717a145b4dcba974ea6144083e5378ae3354
font_01_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 10224 bytes
SHA-256: 8c0528eee300d5a38dcc1ef773cc6fb12ef19c4348984e17a3ea48b9dd588611

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