Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f773f14586c9c0…

MALICIOUS

PDF

88.1 KB Created: 2021-07-26 03:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04c25ed67ca05d5e89b1175bdcb8bef9 SHA-1: 31297f2f76c9e4390c2efc0edf64da6d9c9c392c SHA-256: 62f773f14586c9c049fc3a2f2dacb5b9d9825a595c85bfd65e7d8d93c8a3e39f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://cowichanmusicfestival.com/userfiles/file/mibaxibuzozobolesezepofe.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffa2d0f63---doxofajuxos.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/993621f862a91989017b63e587fe9cba/83232478460.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d558994c6587b23c0917987649d8c84b/80892838808.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607625994aa85---zanadizimiwezab.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/30794423365.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef52caab4---17405854016.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/3476272151.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/45634756344.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b59b040de---75571272492.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/8813922349.pdfIn PDF document text
    • http://sooclose.eu/upload/File/14490647885.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/zikavodabamu.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/zigonakuriji.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2ei9p7s7t8f41eebhilhcjpj9f/wesetixedazaloneviga.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/55302696128.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bc12009e8---51571322924.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/dugad.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/97245727619.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/xusejasofikam.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e43c9bb43---zorejetevutuf.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vneasc13vuk11quo2gek86umb2/nerokigeruposubir.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zajore.pdfIn PDF document text
    • https://energooptima.hu/upload/File/rukulakeloke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=transformar+200+metros+quadrados+em+hectaresPDF 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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11052 bytes
SHA-256: 4a2dc1a40ad2b0bd858bef8ee99d17c921c008205b5fdfc8fa3291f87df31d54
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 19620 bytes
SHA-256: 96cfa75225381d34c535fadccb8366e51bbdbe7836fb492851ebe6d1f7901240
font_02_sfnt_off000137da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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