Malicious PDF — malware analysis report

Static analysis result for SHA-256 653900a0d9c4c7ed…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 06:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 938676a36e04364cc12f8df8f2b55bb5 SHA-1: 6bb3d827cfa3216c07e8b719ded230009e229194 SHA-256: 653900a0d9c4c7edbab01fe4b93ffeac29273d937c4eaf2d4469f4ec245db816
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ludbaegitim.com/calisma2/files/uploads/44606391986.pdf In PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/13582121550.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ff7a003a54740b4cf950b5ee54b945a6/71252658041.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/91156152160.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/88705025978.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/93428265443.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/tonixinovuje.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93c543139---raronalinifarufaxirad.pdfIn PDF document text
    • https://flyags.com/editorResources/file///dusijewozaradeka.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/34218f5917bae326c0772e3b7cf17c01/fisilavopidesasin.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/78352519258.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd5eba814---73265856167.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/9531031413.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae93e8fd8---loguzopar.pdfIn PDF document text
    • http://asustainable.com/global/file/26705784201.pdfIn PDF document text
    • http://bakoca.hu/files/file/79249859680.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4d509a39---fakusunadaviwope.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/51038807663.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/99404862266.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5030caa0ff0ec7942e2acee064a73f9f/55482523600.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/zevabo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db27515c49---18289936008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+converter+free+softwarePDF 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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10484 bytes
SHA-256: 066735b9407e17294be34b82829b9d61750aa38f4a5ce0bbb6fac20ecb0ea22d
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16952 bytes
SHA-256: 4a607bcf7ee13f5c3fb8153caf13826737e530d462355f7659e706ac0c11c8fd
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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