Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2433e582cc5ddc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 07:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bbdbce540b57c1906ad4fcdb8f40f41 SHA-1: c8ed2c7929631d3c76a3145d64201cc229b41a28 SHA-256: ae2433e582cc5ddcc204d2e71f05d1940bbcb658b4e1be39366dd7422afba87d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/dced9572f3278bcb4a4fbcd2cc64f2fa/vefasakugiri.pdf In PDF document text
    • http://annabarons.lv/files/files/dunasujexopuwalarosulumox.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0ecff1d68473bb3ee6fef158b033654f/sikiredewudav.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/65ca2241396cef9998edee93738ca26c/juxifokatelusorugomuf.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210615031917.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/91169b1a75e730ea0d1936e61db92743/limusatugesipepugumawedet.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db59aa9ac84---bisupikixutisefevekew.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/89190492969.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/revokesizufexipaduxijod.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/lirenobetiratakuxu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/sidaluzuluvifotavilobi.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/92520781200.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/69538680443.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1611304e3ae234---lubulagebevipepetaxibaj.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/19310171928.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/69c0253d48356be06941fb5d0d5b6b6b/83498307254.pdfIn PDF document text
    • http://strandedtattoo.net/file/46490290650.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/xiduboxivuduna.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/wataru.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098361335b0d---3219699215.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed48a0fcf0---komefixate.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/liraretevugivimejepoj.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/df07c4e7d7df9f05d4a3d8e7b0ce27ab/32562430892.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609692bd45aad---15859142071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=radioisotopes+and+the+age+of+the+earth+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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 17428 bytes
SHA-256: 0f8e1b63011814a741d00aec8019d8fd66bdf4bc2d78746617162e38907391a4
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 10776 bytes
SHA-256: 9f2afacf6b96e3e64d156d40894dfa9686c3f5f47e30280cc38ffc54126257d0

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