Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9358911830eaa3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 13:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a156b7f71d6318bd67f30871371bae12 SHA-1: 1f33509f2a8413fd605a9764dc672a0aaf9e4de6 SHA-256: 8d9358911830eaa317239587f4d0171b1d7bc9babbd14fe75b0cfa4095916a0c
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool. While no scripts were extracted, the presence of numerous links to potentially compromised WordPress sites suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//giruzofor.pdf In PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5614cdcb4fdd643ba4210eef54671d17/lonegujiruminibot.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/jubegotobetafakekupoxuwek.pdfIn PDF document text
    • https://lesura.net/userfiles/file/10122483825.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/29707371419.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec115b9377---weladazor.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/57368887357.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/dividowagoxolezudedi.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a3j0pcaep28advlocmkf1goidv/kujoramizadumurepumuba.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/gefufewu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/raxofibepoligulowedi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afffea7b8a3---5235364363.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2063737e---45138760.pdfIn PDF document text
    • http://soon-xin.com/fckupload/file/litiweririk.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4ia1jklitumf3kc41srol2lf75/sekufegufilufubew.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7316b414---jomejanoxikapemif.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/49340227767.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tamagevevelazafexur.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/8274844.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/tiwubaniwedukufasu.pdfIn PDF document text
    • http://wohingltd.com/userfiles/nakure.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210807140158100.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wesokenikonasuzopanixeruf.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/lixoxat.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/bavonewoke.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6d6a2a4f---bupananudutebejozezibo.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/kusedijusuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=homonyms+worksheets+with+answersPDF 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_off0000b62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 14696 bytes
SHA-256: 592a45b7b603229f69adb29913bb5883b741d14adb94d2ac28741645cf693928
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10612 bytes
SHA-256: 414f2355d88ce61c2b2a422f6d6aeeaf831daa543d46b50e1b287dd8a8c1d8b9
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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