Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58a241f0fc71df8…

MALICIOUS

PDF

78.0 KB Created: 2021-07-02 00:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7e71f699159391d0bcbd97ed077ad892 SHA-1: 496f1e933ab58f1fbd54896914d46a2c9852e015 SHA-256: d58a241f0fc71df843ad8d0b2e580845895cfa6d6cbf224bd63646b3eed56703
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document has been flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The 'SE_CLICKFIX' heuristic indicates the document employs social engineering tactics to trick users into executing commands, likely to download and run a secondary payload. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+use+2+monitors+with+a+laptop PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098864345789---7766385007.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jexiguvixozugul.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/xedunipaboxupa.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/misozekevaxedikuxipa.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xofefuv.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f88467f12---50730277799.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaaad00504---xojomov.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160907ce93b496---23478499969.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u7png6q3oggkrt41ba3ioea9b0/75717366153.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/99653869581.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mojewajiwazuzad.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160741044a20ae---dusebupup.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ogg1nua6e4a6j9c6vgsl19iod4/gagosewasetokibutonofef.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/betefik.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b3084011---xigavotosijofijubisese.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/97357039023.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zogunewalibevosugu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7fd00958---ruradagukinikipibi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/6043480507.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/17656549228.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607367c3e2bca---65584520425.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/56922361620.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/fadoneteda.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915356dc13d---25390860231.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/vamusaxo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94faeecad---38297049801.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6193a31b8f7e2196c08ecabb52241e62/sigawomezivemume.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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16096 bytes
SHA-256: a8c800bffaca05eb5bf4031a258369d3675c9bb96fc71e7e104453e78e1a4c96
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 10816 bytes
SHA-256: 12d76123640608d615dc1840cba296d9580aad87f01b0c4ae4923b3dec79dca5

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