Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccfcbf52cdebd4f…

MALICIOUS

PDF

90.2 KB Created: 2021-07-24 02:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 903f8e80aee82cc1956f4579ad3a6400 SHA-1: 77002f80d97863724368c461eb3cc6b49d6774aa SHA-256: eccfcbf52cdebd4fadcaa5e4c38192a74851a19b0f9a75efc10df9e9b4865816
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. Heuristics indicate the presence of link farms pointing to compromised CMS uploads and a lure for password-protected archives, suggesting an attempt to disguise a malicious payload. The document body is heavily obfuscated, preventing a direct analysis of its content, but the overall findings strongly suggest a malicious intent to trick the user into downloading and decrypting a harmful file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e75beb5e01d---xatuwotevipis.pdf In PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/12158724664.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/sezudiwiramirumiborek.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9066f52d---95946538786.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/zivabipovuju.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ft2q2mlmmj33utqu6ohr0tg7k6/39826475808.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nerupexibariwuseluta.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/dafajezuzewowakuvabu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7e619b80da694a274a52f35455325f02/32406515785.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/321b98a17c17fec26baf0888b43dc5ec/47389080825.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/37288865034.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/vizibafelediroboxe.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wozubisorox.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/kojewegazaribuxilu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ejo0akisebrf09hfrn5grnk1ie/lorubaj.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/43337628110.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/7953078052.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a49f183fa54---remojebajozefatu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f058232e0b9a7ea3ab055f84e1de5078/kurazanifow.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/5857c53464a548d724ec40f2025454e0/30942054166.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/sufojuluvuxobaluwavusox.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a1510f4d---57787882975.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0afebc3c11cbc5d3427130b65a36d3ee/4202574514.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/5327111041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gta+san+andreas+audio+files+download+rar+androidPDF 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_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 17380 bytes
SHA-256: 6ca1298d33baeab397ceba2dec841d98d3e2a736d360d058509fe15603a3cce7
font_02_sfnt_off000140fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FE 10572 bytes
SHA-256: f837b1797a00b97dbbb6fefecccea16caff57a57e6f32bac76f0a8c9b1864a22

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