Malicious PDF — malware analysis report

Static analysis result for SHA-256 479c419d0028bbbf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 05:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e1c556b4025da9a5c5eedf5a967a65e9 SHA-1: 657c80ac2493d79f3611550e364a77681c774edb SHA-256: 479c419d0028bbbfdb53c9885782a3f26f7589cc4ff162e6f6c36e4eaee1e9d4
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fc9v89hopsr1us0bmep5uej597/8373310588.pdf In PDF document text
    • https://jjpremiers.com/files/rezuwipozus.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/j2eeh240mhrss9bobea10fk89m/72364228022.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/bakumezaretexuzowafavevuj.pdfIn PDF document text
    • http://dd-eng.com/files/files/vabofaxatapajev.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4db46e0ba70524df53a7c38a6eb92081/87145446208.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e4b4c765a4fc41c919194a657f5de642/34920646358.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/65935156495.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c8dac4a436f99cf7099748a5d53bcec2/89813385870.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/77172769987.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/tutabudoximokibimopepol.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/88330337309.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812d6829ce8---620290516.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/89ktnjfme34alf4f5fs4coe579/62772797250.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bisudelukulupevit.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf3579805---38788989588.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84626496391.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/30913913008.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/muduxerodamifudaladufoj.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f5eaccf38f5240cc8af1963efaaedb6/61848303110.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b381792aa5---zibafuposajezesutekap.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052996d7da---85215202759.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/22952088989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bpt+syllabus+ntruhs+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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10660 bytes
SHA-256: 3215598fbe3c1530b0b8b5bb565920a24383ae2137447688a1c5c2a7ac9673f1
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 17276 bytes
SHA-256: 6ddf7bbafcbb328b630ed22d88ca0fcd740e24a637a6300ac0648b926f996d5d

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