Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be0322f17f1f109…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 05:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d60e29c6412d9214816c0d41443a9bb2 SHA-1: 1d8fc1c8db5d14a335a136aa7e7a5fa45f582477 SHA-256: 1be0322f17f1f10946719c13e986fdde36038ff2c858d1f827bd882d4de89673
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous links to external sites, many of which are also PDFs hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b717762725449bb2f04cae269409c2bc/43717794820.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/76284955213.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-30-10-07-30-S9zPs4Ch.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/kifefu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee4867ab42---43116456192.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f80f0707---13768432100.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/pabeviru.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/ligufemifurel.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5bfb7d458548282cf20a2f2fd4221057/64214760260.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899156e7352---rewodebezamakotu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/linogovoxonabigotiv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc970909b1---rijusopejojelatiwab.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ff343eb---razifop.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e0185f6e7fdecc2cd1d288a9f7b7d429/jeralazinazubafurokufesim.pdfIn PDF document text
    • http://soon-xin.com/fckupload/file/vejeliwurinadiwosakupik.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f2a22fb8---53780713650.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/obgpf78hqkhjlnso2fmttju1o5/zoligerurirewele.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/59974571465.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/91297109156.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59748961356.pdfIn PDF document text
    • https://ebooksweb.net/files/file/3022945226.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/51235168448.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/zufulaga.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160814650a5ebb---maxutovasawifi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087669701698---bupemojogixobu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/44032210796.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/xigizerunesesox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=xlsx+file+into+pdfPDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 18096 bytes
SHA-256: 979e9dfe5dd95817a2cd4dada8cee7243bed80217be39bdf631629d9bb59b167
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10340 bytes
SHA-256: b34b4231d49c117f4a4114f7ec5c3e8090f1a950dbb99b5d5a63081723945156
font_02_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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