Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae7a4d067b90c01…

MALICIOUS

PDF

98.3 KB Created: 2021-08-01 10:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b22102ff055ced8e3568ebf779ce4b1d SHA-1: d7d172d5f20f00250e228f9ecdeb3ec7f9bab2c8 SHA-256: 8ae7a4d067b90c01d8ede2b86ba1175d35ef08b170c516b3fcf51668cfb399a0
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. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to potentially compromised WordPress sites or disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, aligning with the Spearphishing Attachment technique.

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022f54d2e4---44100380988.pdf In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08fa847e6---danam.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/resonowovaz.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/funoretipapolawulazavipe.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210614185255.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098888089be3---19407797729.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tonire.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1f5173d5cf24d8064620bd3b12d9d2bc/46829763068.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c6b5ee19---73580233903.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e91ae0ca8---bejilejasifidukobilus.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/f6f2f13ca7367258fa98a4dde2bf535c/40517398639.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18614a5db---pivagodebelatemole.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a70c81251ca98dacefdd357566726c42/nukakarubole.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/49305476936.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/94149794549.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/lifosonixudajojituvis.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ob58ka3j16tbuirvppbte7iosg/jefewupiserizevawadixu.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/29760543938.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/lubuxi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/788e042abf4e6deb41e417a7e14a3707/lexefip.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9312df026---pozusaxijofejunadamijuzej.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a1ac80d5---16105890648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+free+money+in+bloxburg+without+workingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 10956 bytes
SHA-256: bd8429e5533219ca83f296283d938034c1bca9cb9995ebc2b98db52b5c2cc3e3
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 18168 bytes
SHA-256: 3dffd4e62ba808e8557288f9cbbf93deea05324975cc381fc2f5b0d71209fc74
font_03_sfnt_off00014ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD2 17440 bytes
SHA-256: ca48c18f8ad0d6827b5b2d29e56389aeb9bc80f16e87fee38625a2249f13c829

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