Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d9b2df5015bb74…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 14:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e1a3ea89682392c3bbaf31ba60bac7c SHA-1: de7f0e425942127448d9c31a70482e029957be0c SHA-256: 53d9b2df5015bb74a78c749da68ba3a316acfba16608df38fdfb1bddf72935bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to manipulate search results or host malicious content. The presence of embedded JavaScript further supports the possibility of malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ubest.ru/images/file/84482784366.pdf In PDF document text
    • https://mimpiindah1.com/contents//files/39372068712.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/kivez.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///pimubuxosejata.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a00cf8c5119---gabewufulevufaguxiri.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/jideviganikadevixilobarot.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2d89b70981873b8e1bc02ea83914b2f3/47773277232.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/50322374200.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2f9a18c8b3a6c97fe7efcea56eaf70df/39515761523.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e30770ee---31261880479.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/bobigatetabiwim.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/466e6f6c2778f96d9fdcd382a0fd6d85/75213683133.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210720_0788F87A15C6C2E9.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/jalagizot.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/49762169936.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/10891090191.pdfIn PDF document text
    • https://ibericadearmerias.com/file/petilegi.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd6ed958c---letisidubufodokuvezuxo.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pekakofanolu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/18a8f7f7fa0798dabb7b431941deb23a/wutegikudobupumaronuwevaw.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/45008171086.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/zutuzowipu.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/vufimu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b66503082---82751171261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=utility+maximization+theory+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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 18896 bytes
SHA-256: a27e88b82d3ff4675a763b542cc2f72b8d0c3696bbdfec86aef3b9667df2dac8
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 10876 bytes
SHA-256: 39e822a609768f117ea8405cb93e4c1bf79bee33bfeaa323f58c4496d9ee5311

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