Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eaef37b8df895ec…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 07:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2b420f1c0e8e34e3ce47d8503f9db592 SHA-1: cbc02938f06700ceb8fafdecef6ef4411a8d6403 SHA-256: 8eaef37b8df895ec664bf08597b6f7e39c7cd04b8afb700240644971bc7d6ad4
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9963

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://gamaconsultores.cl/upload/file/2267208461.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/fijemomuv.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9f932e688---penusanuzelid.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46ec87c21a---55253136548.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b758392c3---zikexeti.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vinotidagoxuselotomuridix.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2e92fe04---78341768962.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/9b96b8fc124d102c4631767d4501bc7e/vogiketi.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/95186462787.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d3563a0ef8a93f9c90962021667d59e6/sexulutemul.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/20298572054.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b3caa515301d8ee1cce2bee4e6259d11/bewidefajopemofewusutix.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/muzig.pdfIn PDF document text
    • http://samtekelektrik.com/files/lefuwenigezojir.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/filib.pdfIn PDF document text
    • http://machin.kr/userData/board/file/mazosifufapo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160808b2b39ae1---38897847966.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d93ea5ba355e48af2a1ca2343bcd8940/85358378225.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/sifaxe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4a02cce4d---13134409450.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6bf1eceef90099de4f9814e78f4cf857/73830848226.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e91ee9959---dosojuwafadowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=university+physics+sears+pdf+downloadPDF 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_off0000bdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 10992 bytes
SHA-256: e5305ebbce9ed7afd6700963c16d1df78a1e990bb5cf3ac6581302af40d49405
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 17348 bytes
SHA-256: 7ec0286f7ef7203c742cf8beae1ff76abe0db326e0d8c885b19e773ce9221dbd
font_02_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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