Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ada0fb7681fa4b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 04:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 238fefffe3b8e63a97018b890c778776 SHA-1: 439b0b62fef32f0478c5b5e3e45447c99a0abb50 SHA-256: d4ada0fb7681fa4b697da65246eb6a0c0cfa405d1fa64d8e47f26e6e8ea6b42c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to distribute further malware or phish for information. The heuristic firings suggest a pattern of SEO manipulation and the use of compromised CMS uploads to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724248299fd---metukofiguzavejufozo.pdf In PDF document text
    • http://dzbnf.com/upload/file///mirazawojinorilevu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa353b1---59306548921.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/vudasivabo.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/79897709184.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711cdfae273---dobibuvomosefabakuga.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/93226451063.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5207357ad---seranori.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113dd31b5722---24756928592.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/fubonuturumub.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/konavatan.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/44981003294.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d93587ac---fagakekiroziwedeniwobi.pdfIn PDF document text
    • http://adice-area.com/pictures/files/jawalepopagopuluwod.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///95339723355.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096267b4e303---bepezajopakax.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/79989594778.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/89512131162.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wopisibivakemari.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7fb1680d3---14817472414.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6db8f11dd---92957602854.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/78057963153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=public+administration+lecture+notes%2BpdfPDF 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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 11020 bytes
SHA-256: e03b171d91165fd7321b473d59ce60c6b324e15d00af4a0cf38b011b122950f3
font_02_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 17660 bytes
SHA-256: 226e525e0c449db9d6f12f917b76e28af974e8506fd541b820520eaf1db2121f

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