Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb5a55f5f12314e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 22:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcb337220d4894498f4f93dfb0a426a3 SHA-1: 16252b71b294e38ae4cd54092c02e20a743dae3a SHA-256: bbb5a55f5f12314e8861efe27ee1e530dfd66d8079de2661a74fb42ca7e3a7b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://globalcareerclub.com/FCKeditor/userfiles/file/80624726418.pdf In PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/47266640684.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/wororeratokuj.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eq2nbcme2718319lelclsbnobg/kumifawavanawexo.pdfIn PDF document text
    • https://palet-school.com/files/files/48720622188.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/51499725531.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/movanuv.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nixakekiwozovupol.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/wijelojaz.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/vivavewamika.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/40768433b67b4b59af7616c2d4743506/20105855537.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/vojenawi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68e690710---43074621769.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fikubapofawar.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/fiperukujifazajifuwe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdb802fb9c---bejigetiwulemareniru.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/68353506061.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/5978635182.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649a9e58fb---xifetilalafonudut.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/87330714990.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161380d7d69242---sabofudu.pdfIn PDF document text
    • http://consade.com/userfiles/file/marolefo.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/67801093264.pdfIn PDF document text
    • http://adice-area.com/pictures/files/81866743778.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/12739851017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=camera+keeps+stopping+miPDF 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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 15684 bytes
SHA-256: e9140b0e1074c4fc4b9ded7c0f0d9312afcfb4c6ae13bb45be262cb0e7279430
font_02_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 10672 bytes
SHA-256: 8d6f1e552eaf8a9bc20b97707d75180b34707c06c9fc1fc252d88be8ea8cd2a3

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